I've tried the Ringo with zero results. Not a dent as far as cleaning. It doesn't even remove the calcium deposits in my tub/shower.

My boat only sees a few hrs a weekend in the water. The rest of the time it's on a lift. Every fall when I take it home, I also have those yellow stains, but only where the lift bunks are. Carpeted bunks 1st couple yrs, then changed to the plastic bunks. Made no difference. The bottom gets waxed twice every spring, except where the trailer bunks are.

Sure is a wide variety of opinions on this one. I have been using on/off for over twenty years with smiles and no regrets. I can't imagine how others think it hurts the gel. I can only guess it is because scotch brite or something similar is being used. I think everything else is a waste of time and effort.

I believe this , you believe what you want.

I agree. I've used FSR for years and it doesn't hurt the gelcoat. Starbrite marine teflon polish helps slow/delay the staining. I did part of the hull with and without the polish to prove it since it's so much work.

I use a product called "Slimey-Grimey". Its in crystalan form, comes in a little tub. Mix with water. Same as On-Off. No rubbing, just spray it on, rinse it off. Work instantly. Bad for the trailer though, need to rinse fast and thoroughly.

However, this thread was really about what could be done to prevent the staining and I still contend that wet sanding and buffing would be the best thing. I believe the gel becomes porus and enables it to "suck up" the staining.

I use the same as ThridBird. Slimey-Grimey
Get the bottom clean then apply two coats of Future Floor Finish. You'll still get some stain, but will wash off easy.
My third year using it.

Most Home Depot or Lowes have it.

http://www.floorcareproducts.com/floor-finish/index.asp

I use McQuires Hot Wheels Tire & Rim cleaner form Advance auto. Spray it on, smear it with my if necessary, no fumes. Take sit off and it doesnt come back quick. Cheap too.

Probably a dozen products out there that owrks. But the common theme is not to use strong highly caustic material because just like BillR says, it will come back quicker and with a vengence because it makes the gel coat porous. Then you're doing it each time you use it. God forbid it sets in the water overnight.

If nothing else, NEVER, EVER use On/Off. First use, you're done. Read the label. At least three highly caustic acids. If one don't get you, the others will. I suspect it's meant for the cruiser boat with painted bottom or something that sits at the marina in the water 24/7.

Unbelievable.

http://www.iod95.com/info/faq/instru...Repair%202.pdf

Go to page 6 and check out hull discoloration and restoration

I tried McQuires Hot Wheels Tire & Rim cleaner form Advance auto. It didnt do anything. I have a light brown stain from miss river that wont go away. Thinking about tring some bleach on a rag. Bobby

I have heard, not yet tried but am going to, BIO KLEEN hull cleaner and then their sealer and polish. I have heard really good things about both, especially the sealer and polish, potentially picking up 1-3 mph just by using it!! Definitely going to give it a try.