Rain-x Plastic Water Repellent
£6.99 (Halfords)
www.rainx.co.uk
Despite the bottle carrying no actual warnings (just a note to have bottle handy if medical attention required), the data sheet on the company website makes for fairly terrifying reading. It was very specific that this should not be introduced to water or sewerage systems and it goes on strange — apply to a cloth and then onto the visor but the liquid sits on the surface of the cloth. It’s also difficult to get even coverage and a good dry finish. However, it works pretty well — water begins to run-off quickly and the treated side was clear quickly with remaining water beading well. It maintained its performance for four soaking events. A good performance — just a shame it seems to be such unwieldy material.