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WD40 is good on coloured plastics, I have never had any guttering dry after applying it.Like someone else said on here it is oil based. I only use it to "finish off" the job, I use Syroflex to clean the plastics.Cif is too abrassive on plastics, it might look clean after you use it, but deep down you are actually causing faint scratches on the plastic. this will in turn hold on to future dirt and makes the next clean a nightmare.Matt