How to remove algae or fungus from fiberglass, awning, etc.

[paulw]

Lysol Power toilet bowl cleaner
Our 21 has been sitting since May and had extensive staining as you describe. My usual go to, Meguiars Color Restorer 44, wouldn't touch it .
I did a search on YT for gel coat stains, and this is what some boat detailers were using. I think it's a bottled version of the mixture described in Langley Barb's link.
Anyway, it worked...now I get to do a polish and wax.

[kym]

I had terrible trouble with bugs, tar etc. A friend suggested dampened dryer sheets . Cheap, easy and fast. Rinse off. Works well.

[TTMartin]

Originally Posted by nwBob

I am getting small red spots on the fiberglass, awning and propane covering.
What might it be?

Looks like spider poop.

Pain in the butt to remove.

Edit: How To Remove Spider Poop From A Boat

STAR BRITE Spider & Bird Stain Remover Spray - Quickly Dissolve Bird Droppings & Clean up Spider Mess - Won't Remove Polish or Wax

[escape artist]

Hi: All... We've had several times when our 5.0TA has been covered with "Artillery Fungus". The spots fix themselves to the surface and require a mild abrasive cleaner to remove. Very labour intensive and defined as a PITA!!! Alf
escape artist N.S. of Lake Erie

[UncleTim]

I would suggest trying Goo Gone, goo and adhesive remover. I use this on the inside walls if they get scuffed. Works very well for most of this type of stuff.

I also use it on exterior walls. If you waxed the trailer with Meguiars wax, this and another product called Bio Green Clean will take care of almost anything you spill on it.

Bio Green Clean is the understated cleaner here. A++ in results. Completely safe and works wonders inside and out!

Goo Gone is a totally safe citrus based product. Highly recommended.