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
Hempel Cleaning Gel
PRICE: £14.95/500ml (£29.90/lt)
Hempel’s Cleaning Gel is a thick bright blue gel, the thickest on test, which required some squeezing to remove from the bottle. It could then be applied with a brush on to the stained area. It should then be left for 15-30 minutes and removed with freshwater hosing. It can be agitated with a brush if required. Some light staining remained after the first application, but a second dose resulted in a clean white hull.