I saw this on our Honda C70 Passport yahoo group. I Haven't heard of this product, but thought I'd pass it along.
Mike Sal
"Rusty tank on my '82. Dropped a handful of drywall screws into the tank and tumbled it in the dryer (wrapped in pillows) for 2 hours - all I got was dirty drywall screws. 24 hours with 50/50 Milk Stone Remover and water left it nice and clean inside. Rinsed it with WD40 now it's waiting for spring."