How do i get this out?

[gman546]

No matter what i do i cant get these what look like to be either spider poop or bird poop marks out of my gel coat. i sit there with marine spray 9 over and over and its like its baked into the white gellcoat. Lake erie. do others have this issue? what do you do?

 

[flashback]

Wet sand it with 800- 1000 grit sandpaper and then buff with a good buffing compound.

 

[Scott Danforth]

get some oxalic acid (wood bleach) and mix it up

most hull cleaners have oxalic acid.
most toilet bowl cleaner have oxalic acid.

 

[tpenfield]

I keep a bag of oxalic acid on the shelf for cleaning mineral and iron stains.

 

[redneck joe]

how is that acid in the water from overspray?

 

[tpenfield]

how is that acid in the water from overspray?

Minerals in the water . . . acid to get rid of it.

 

[DeepCMark58A]

Go to $ general buy toilet bowl cleaner, just like a toilet apply and let soak may take two applications but the stains will be gone.

 

[Scott Danforth]

how is that acid in the water from overspray?

Oxalic Acid is made from Rhubarb.

its a naturally occurring acid, just like oranges and tomatoes

Go to $ general buy toilet bowl cleaner, just like a toilet apply and let soak may take two applications but the stains will be gone.

sno-bowl cleaner used to be the go-to.

however I have been buying oxalic acid in powder form to mix up for rust removal for the past 15 years.

https://www.amazon.com/s?k=oxalic+acid