Which gelcoat cleaners are best at combating waterline yellowing on boat hulls? Ben Meakins dons his rubber gloves and puts 10 products to the test
PRICE: £19.95/950ml (£21/lt)
Star brite Hull Cleaner is a thin oxalic acid-based liquid and can be applied with a sprayer or sponge. It foams as applied, and is then left for two minutes and rinsed off with fresh water. This required the least time left on the hull, and after only two minutes the staining had gone. The foaming liquid could be washed off easily and without needing a sponge to shift it.