We’ve tried plenty of spa cover cleaners but none were nearly as good as 303. Developed from the aerospace industry, this contains no silicone oils that usually leave the vinyl surface greasy and attractive to dirt. 303 bonds into vinyl surfaces to block the sun’s UV rays and guards against cracking and fading. It is also great for other products including rubber, fibreglass, tyres, plastic, leather and dash-boards. Available in 8oz spray or 16oz trigger bottles.