most tint places recommend nothing but warm water (maybe with a drop of soap) for the insides (the tinted bit) of your windows to help prevent the tint going purple or getting damaged.
Personally I use a damp chamios on the inside and kitten glass cleaner on the outside (also the inside of the windscreen). For my $$'s I find kitten cuts through the gunk beautifully
(Mind you, I'm sure there are lots of products which won't harm your tint, but in the end water is the safest thing to tell everyone to use).
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