Heavy mineral deposits on bottom of hull. HELP!!

[Stillfarm]

Have tried to buff with rubbing compound, 2000 grit sand paper and have had no luck removing this skudge. The rubbing compound hardly does anything and will not move it. The sand paper seems to move it a little but makes more of a mess because it gum's up. Also I have tried using some denatured alcohol and that does nothing. We think this is mineral deposits from the water in our lake, the boat has been sitting on a lift feet from the water. Probably due to the water splashing up on the bottom repeatedly and then drying. This deposit seems to only be on the center back portion that is most exposed to the water. I will try to include a picture. Any suggestions to getting this off would be great and much appreciated.

[Chexi]

Starbrite hull cleaner. Or muriatic acid and water 50:50 mix. Be careful, this can eat/discolor your bunks. Rinse either one thoroughly.

http://www.thehulltruth.com/boating-...ning-hull.html

This thread is helpful. Might want to try the toilet bowl cleaner.

[skiinxs]

Try 50/50 vinegar and water/ If that doesn't work, try CLR or the already mentioned Starbright cleaner.
Dave

[mrbobolina]

I used a high speed rotary buffer and marine rubbing compound. My buffer has a variable speed of 1000-5000 rpm. It is what you use on smoothing clearcoat or making a paint really bling.

It is great for something like you are talking about, but you need to know what you are doing with the tool or you can damage the surface by heating up the gell coat.

[CradGen2]

I'm not a fan of acid on my boat. When I did leave my boat in the water I used Soft Scrub and a bathroom brush. Takes about 4 hours to do a 196. I do mine dry, hose then come back with soupy water. Wear goggles.

[liquidforce]

I just used Slimey Grimey it works GREAT!!! should work for you.

mitch