Hull cleaner and Stain Remover
We've tried this extensivly - amongst the best waterline stain remover on the market.
We've been selling this in our showroom over 15 years, and have had numerous feedback of great success.
Now it's packed in a convenient 1 litre plastic bottle for easy boat storage.
It is a semi acid based waterline stain remover that requires very little rubbing to remove those rusty type stains that tend to yellow a vessel's water line.
Premixed liquid, simply use a damp cloth to wipe over the fibreglass surfaces of the deck or hull (don't use on teak areas), leave for 8 - 10 minutes and then hose off with fresh water, it re vitalises the gelcoat colour and painted surfaces, to give a shiney and bright surface.
One bottle generally does the average 30ft craft for 18 months.