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Hi Steve
The UHTC cleaner is fine for cleaning the filter, just use the same methods as cleaning lens etc. If the mould has been there for a while it may have eaten into the filter coatings but you should be able to clean off most of it and it will work fine. The filter is mainly for nebulae, not much use for galaxies though and is a visual filter, not really for imaging, though I have used a Baader UHC quite successfully for imaging from Borlte 5 skies.
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