Re: Whats the best, cheapest hull cleaner you have used?
I have used Swish toilet bowl cleaner but cut it 50% with water. Full strength makes me too nervous. Anything meant to scour porcelain crappers clean has got to be harsh for gelcoat. On and Off (at 10 times the price) works about as well as 50 / 50 toilet bowl cleaner and water.
Also, be sure to rinse really, really well. (And not near the lake!) Especially if your boat was cleaned on a bunk trailer and the carpet got saturated with the nasty stuff.