My bike helmet (BMW) is quite specific in prohibiting cleaning the shell with petrol or with solvents, only clean with mild soapy water. Alcohol based cleaners may be used. Painting only with manufacturer's approved paints, no mention of stickers which is not unexpected since government compliance stickers have to be attached. BMW recommend a 5 year life.
Unfortunately the paucity of information from Helmets Ltd on the Alpha 900 precludes any real knowledge of what to do and not to do
The only instruction that I have is a photocopy of a page that highlights that the fitting pads must be stuck on the inside of the blue coolmax liner and
not to the inside of the helmet shell. Obviously a reflection on the issue of the adhesive reaction with the shell material, but disappointing that a more comprehensive set of instructions aren't supplied with such an expensive and critical piece of safety equipment
