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Give them a good wash, then dry, after that apply a polish or wax, kitten no1 or similar, comes up great AND protects the plastic, try it you will be surprised as I was.
Vuplex is good, gave it a go for the first time recently and was very impressed. The other products mentioned may work also, but after trying Vuplex I will be surprised if I ever bother trying anything else.
Vitamin Sea, have heard that the pink hand cleaner (septone???) is good for cleaning upholstery also, haven't yet tried it, but it came from an upholsterer also.
outwide i just checked when i got my canopy/clears done,
1998 they too are still perfect mr sheen approx 3 times a year
it appears there are many products to protect that are good for their protection
Also, a mate of mine has a boat and there is a sticker on the windscreen that says 'do not use soapy water.' He reckons it can cause the windscreen to crack over time. I wonder if this is just for this style of windscreen, or other people have been given the same advice.