GET $10 OFF $50 OR 20% OFF $100!*
Harbor Safe Marine Care Products
Waxes, Cleaners & Polishes

Marine 31 Mildew Stain Remover Refill Kit

Marine 31 Mildew Stain Remover Refill Kit
Keep mildew gone all year long!

Mildew stains is a constant struggle for those who own a boat. It will always rear its ugly head, even if you remove ever bit of it the first time around. So, you’ll probably need to remove it more frequently than you would like, and that requires A LOT of Mildew Stain Remover. The Marine 31 Mildew Stain Remover Refill Kit will provide you with plenty of Mildew Stain Remover to get the job done several times over. You will also get the tools you’ll need to clean the mildew and a special funnel to make filling your spray bottle even easier!

Items in this kit:

Marine 31 Mildew Stain Remover 20 oz. & 128 oz.
Marine 31 Mildew Stain Remover quickly and safely removes stubborn mildew stains on virtually all marine surfaces, including vinyl seat cushions, rubber fenders, fiberglass, gel coat, canopies, and more! Marine 31 Mildew Stain Remover forgoes volatile cleaners and instead relies on smart chemistry; even the most severe mildew stains are no match for the incredible cleaning power of Marine 31 Mildew Stain Remover.

Vinyl Scrub Brush
The Vinyl Scrub Brush is composed of gentle and soft Tampico bristles that are guaranteed to be gentle on any vinyl surface. The Vinyl Scrub Brush will work the product deeper into the minute pore of your vinyl, allowing it to penetrate and work more effectively than rubbing alone!

Black Edgeless Microfiber Towels
The Black Edgeless Microfiber towels are ideal for cleaning various surfaces. The edgeless design ensures that there is no unwanted scratch potential due to any flaws in the seams. The 16”x 16” size gives you enough surface area to have up to 8 working quarters when folded properly, but it is not so large that it becomes unwieldly. Because they are black in color, they will not show staining even after many uses in various cleaning processes.

Threaded Refill Funnel
Threaded Refill Funnels attach to most bottles ranging from 4 to 35 ounces, making it much easier to refill your favorite car care product from a larger half gallon or gallon jug. Use them once and you’ll wonder how you ever went without them! Since the Threaded Refill Funnels help prevent accidental spills, they should pay for themselves the first time you use them!

Kit includes
1 x 20 oz. Marine 31 Mildew Stain Remover
1 x 128 oz. Marine 31 Mildew Stain Remover
1 x Vinyl & Leather Scrub Brush
3 x Black Edgeless Microfiber Towels, 16”x 16”
1 x Threaded Refill Funnel

A total retail value of $97.27. Save $39.28!

Federal regulations prohibit the shipment of this products by air, UPS 3 Day, UPS 2, or US Mail. This item is shipped by UPS Ground only. Sorry but no APO or FPO addresses.

Marine 31 Mildew Stain Remover Refill Kit
Item #: M31-370-RFK
Our Price: $97.27
Sale price: $57.99 - You Save $39.28 (40%)
Availability: Usually ships the same business day

You May Also Be Interested In These ...

Our Price:$155.82Sale Price:$99.99
Our Price:$70.95Sale Price:$39.99

Product Reviews

47 Reviews
87% (41)
9% (4)
4% (2)
0% (0)
0% (0)
98% Recommend this product (46 of 47 responses)
Works amazing!!!!
Our Pontoon boat cover was bad. Dirty, moldy and looked like it had some kind of something growing on it.
It took 2 of us 3 hours of scrubbing but Marine 31 got it off. Seriously almost looks new.
Here's what we found works the best:
• Spray generously
• Let sit 4-5 minutes
• Scrub area with stiff scrub brush
• Add water periodically to keep service wet
• Rinse area
This product was recommended to keep by a boat cover maker. It really works
Wellington, FL
It really works!!!
We didn’t even need to scrub.....our boat seats look brand new!!!!
Rome, GA
Great Stuff!
He’d used several different products to remove mold from boat seats with little results! Applied Marine 31, reapplied and did NO SCRUBBING! I highly recommend this to everyone! Bought the kit oh 1 gal.,1 bottle, brush and cloth. I will be a returning customer!
ProsQuick and easy
Eatonton GA
Worked really terrific! Would suggest you wear gloves. Patience is required! Lol
Lake Keowee SC
Best mildew stain remover that I have ever used. Useful for many other applications.
The product is excellent. I have been using this product for a while and will continue using it for my boat and outdoor cushions.
AL Gulf Coast
Repeat Customer
Use Marine 31 every spring to prepare for boating season
ProsIt works as promised.
Great Product
What a great product I use it in all my boat restoration thank you guys so much.
Irmo, SC
It Works!
Applied and the mildew dripped off. A little brushing and the sear was new again.

Cape Coral, Florida
LOVE this product it gets ALL the mildew & spots off!!
We’ve bought MANY products over the years and this is the REAL DEAL!! It removes ALL the nasty mildew and residual spots. Brings it back to NEW.
Isle of. Palms, SC
Mildew is gone
Worked wonders on my boat seats and rub rails. I have used it around the house with the same results. Great product, bought both the gel and liquid well worth the price.
Had leaked on arrival
Product it self is great
Simply the best
Cudjoe Key Florida
Mildew remover
It was the only product that even touched the mold on our pontoon seats. We have recommended it to many of our friends and they loved it.
jax fl
Best on the market
IT IS the best product I have found to clean your seats and vinyl floor on your boat hands down. no need to do any hard scrubbing spray on and wait till it looks like pee running down the seat and wipe away
Not sure
So to be fair, I have only used this on one cushion so far. The cushion did not have mildew or mold on the outside but rather some shading of mildew from what I think is in the vinyl. On this particular cushion it has made little to no difference. However, I don’t have much mold or mildew on other cushions so I have not been able to try it anywhere Else yet since I bought it specifically for this cushion
Crystal Lake, IL
The Best Product in the Industry
This is the best product that I have ever used on a boat. The Marine 31 product should be in every store. It’s an amazing product and it really works, my boat looks brand new. Thank you for making such a great product.
ProsIt fast working and will bring your boat seats back to Looking new!
Ponce Inlet, Fl
works as advertised
When I initially sprayed the mildew remover on my vinyl seats, I didn’t think the product was working. After letting the product set for 3-5 minutes and agitating lightly, i was very pleasantly surprised how well the mildew remover worked. in some cases, i had to reapply several times, but overall the mildew remover worked as advertised. i wish I had used rubber gloves during the application because my fingers did get badly irritated, znrxt time zi will be better prepared to use this excellent product.
It works on siding !!!!
We have mildew on the north side of the house. It never really gets sun. Marine 31 gets rid of the mildew with one or two applications ,no scrubbing. It also doesn't bleach out the red color .
Awesome product
Tried several products in past years. This is by far the best ever.
ProsSpray and wipe.
ConsVery bleachy and wear gloves or your hands will smell like bleach for days.
Shawano, WI
Works good
The product works good but has the same results as other products at a less expensive price. The micro fiber towels are a nice product
Amazing product
We thought we had tried everything to get our boat seats clean. But, nothing worked. We heard about Marine 31 and thought we’d give it a try. So glad we did. It is amazing. So, we are now customers for life. Couldn’t be happier with the product, the service, and the results. Thank you!
Dancy, Wisconsin
1999 Pontoon looks like new again.
We are extremely pleased with the way Marine 31 removed all the dark mildew stains that typically occur on boat upholstery. We have tried and used many other products but have never gotten the beautiful results as with Marine 31. Our 1999 pontoon looks almost as good as when it came off the showroom floor. Thanks for the great products, we will be looking to you for future boat maintenance products.
ProsFast working with little effort.
Conswill bleach clothing so read directions and wear gloves and old clothes.
Pensacola Florida
Best mildew remover
My boat seats look brand new. I have turned on my boating neighbors to this great product. Worth every cent. Easy to use also just spray on let it sit few minutes rub it in and rinse off !!!
This boat was covered with mildew from tarp and debris from Hurricane Sally. I had used Marine 31 before and had some left well this boat Baby Blue was cleaned yesterday as you can see she looks brand new.
Baby Blue and I can’t thank you enough for this great product ?
excellent product
This product works as advertised and is the best mildew remover I have used to date. I just purchased a used boat which had a lot of mold and mildew in bilge and storage areas. I sprayed the product on waited 3-5 minutes and washed it off. The cleaned areas looked new.It worked as well on the vinyl upholstery and the vinyl trim. It did not work as well on the caulked areas and needed numerous treatments in some cases.
Parsons, Tn
Great for removing mildew! The best thing I have ever used. Would definitely buy again fans will when I use up what I bought. I’ve tried everything including straight bleach to remove mildew on a lawnmower seat. After putting it on and leaving it for several minutes it come right off. I use it in my boats too that both have white interior.
Panama City, FL
Mind Blown - it works!
I made this purchase based on the reviews and the fact that I had tried every product I could think of to clean these 20+ year old boat seats. I sprayed this product on and went in the house for about 10 minutes. I grabbed the cloth and scrub brush expecting to go outside and put some elbow grease into trying to clean them and my jaw dropped....the mildew was gone! All I did was spray and walk away. WORTH EVERY CENT!
ProsRemoves mildew from boat seats and fiberglass with ease Works quickly Requires little to no scrubbing
ConsWorks excellent on mildew but not all stain types Pricy Might recommend a conditioner after use to keep from upholstery from drying out
Midweek remover
Love this product. But the shipping doesn’t work. This time gallon jug had leaked part of product out and small spray bottle was not in package. Had replacement sprayer, gal jug, funnel, brush and clothes. But that will not stop me from using this stuff,

What do you have for removing mold from boat carpet?
Minetto, NY
Marine 31 Mildew Remover - BEST PRODUCT BY FAR!!
Marine 31 Mildew Remover is the best of its type! I have owned boats for 30 years and this product outperforms everything I have every used to combat mildew. This year we opened up a family owned boat that had not been uncovered for two seasons. The boat had been stored in a shady area with a full cover over the cockpit and bow covers. Once uncovered, there was mass mildew all over boat. The seats, cushions, dash and steering wheel were covered with mildew. The covers and top half of boat were bad also. After scrubbing attempts using several different products that I have tried over the years with no luck, the family was disappointed, even contemplating selling the boat at a loss. I came across Marine 31 products and figured why not, let's try. Miracle product!! Amazing!! The mildew melted away with zero scrubbing! Simply spray on, wait a few minutes, wipe away and then simply rinse with water. 100% of the mildew was removed. I truly wish I would have taken before and after pictures. Unbelievable success! During the next holiday family gathering at the water, I surprised everyone by pulling the completely mildew free boat up to the dock. Everyone was in disbelief that this product alone made the boat look new again. Several thought I must have had the entire boat reupholstered. I cannot say enough about the ease and results of this product. *** Read the label *** Not for fabrics, carpets or certain covers. It will "bleach out" fabrics... but will not harm colored vinyl. BUY WITH CONFIDENCE.
Prosease and results
ConsBleaches fabrics. There is a warning on label so be aware. Put down a drop cloth - do not let it drip on carpet. Success of product is AMAZING though, best product I have used in 30 years of fighting mildew and mildew stains.
South Carolina
Been waiting for a product that really works
We had black moldy spots on all of our pontoon boat seats.(For a few years) We literally tired everything to get it off. A friend told me they had the same problem and raves about Marine 31. I had my doubts but oh my goodness! It was truly amazing! Every bit just disappeared with hardly any effort. So glad to have finally found the answer. Have recommended it to everyone!! Don’t waste any more money on anything else.
taylors island md
needs better packaging
marine 31 is the best mildew and mold remover hands down great product i have ordered 3 gallons over 2 years the reason its not getting 5 stars is because every time i receive it the bottle is always leaking and the last time i ordered just 2 weeks ago they could not deliver because it leaked in transport better packaging is in need do not expect to get a whole gallon the package is always wet