Had a chance to try the soot remover and I have to say I am very impressed. My 42C gets a good amount of soot on the sides where the exhaust exits so I tried the remover AFTER the boat sat for two weeks. After I applied it, a wet rag removed all of it, no scrubbing whatsoever. The only thing that would do this besides your product was a acid based cleaner like roll off or something aggressive. Thumbs up on the soot remover, next will be the non skid cleaner.