Hiya,
Yes steffen, the polymarine cleaner is a darn good one. I used it last season on my 4,7m RIB, and got very good results. Used about one and a half bottle of the cleaner.
I wouldn't experiment with household chemicals. For the GRP Parts i used a strong household cleaner. Worked really nice, but i'd never let it on my tubes :)
The polymarine is worth the money.
cu
martin
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