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Peter distilled water is just that, it still has ions in it. You need to use de-ionised water if no marks are to be left. The UHTC are as tough as nails and I have never managed to scratch one in many years of ownership. It is very unlikely that you have done any real damage unless you cleaned it with steel wool or something similar. It takes a lot of dust to really affect the image so it really is not necessary to clean very often.
Mark
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