For the first time ever last summer, my boat had a ton of zebra mussels
attached to the outdrives of my boat when I pulled it out in October. I keep
it in Lake Erie for the summer.

I use VC-17M anti fouling paint on the bottom of my boat and love it but I
don't want to paint my outdrives - the boat's a 1993 and the outdrives (Volvo
DuoProps) look like new. I'd hate to ruin their appearance with a paint.

Does anyone know of a clear product - spray or brush - that would protect the
outdrives from zebra mussels?

Except for this last summer, I've had great success spraying the cleaner called
"On / Off" (some kind of acid) and brushing the outdrives clean easily. Those
darn zebra mussels were tough as nails to remove. I had to use a plastic paint
scrapper and then scrub with the acid to clean the outdrives.

Any ideas? A guy at work suggested "Scat". I never heard of it.

Thanks!