ZerO Deck and Sail Cleaner is a really effective but gentle product for great cleaning results on all exterior areas of your craft. It is really effective on furnshings such as seating areas and also all hard surfaces such as GRP, Metal, Wood and Glass. Deck and sail also works really well on cratch covers and even sails. The gentle surfactants combined with friendly bacteria ensure great cleaning results and a long term cleaning action. To use on hard surfaces, simply spray onto the surface to be cleaned. Agitate with a soft brush if necessary and then wipe or rinse away and allow to dry. On seating areas spray, wipe and allow to dry. On cratch covers and sails, spray onto the area to be cleaned, agitate with a brush to remove stubborn stains and then rinse and allow to dry.