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Hi Guys
I semi regularly clean my filters, about once a year, just clean them as you would your eyepieces, gently.
Beware that some of the coatings maybe a bit soft so first, blow off any grit and dust and gently wipe with a lens brush then wipe softly with an cotton bud dipped in lens cleaning solution then gently pat dry with an lens tissue. That's it, pretty easy really, gently does it at all times though.
Regards
Jeff
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