How to clean my filter

Hi,

I just returned from holiday and noticed that my filters are a bit dirty.

The dirt seems to be finger grease and dust.

Is it ok to use conventional window cleaner to clean the filters or will this damage them?

Thnaks

I use a lenspen or lens cleaning papers.

I use the cloth I bought in the photoshop to clean the lenses for cleaning the filters too.

First try some warm breath and wipe with a microfiber cloth or soft cotton such as twoel or tee shirt. Some window cleaners contain ammonia, which may or may not damage the coating. If the warm breath doesn't work, lens cleaning fluid or a lens pen will do just fine. But first, be sure to use a blower to remove any particulate that may be on the filter.

Never re-used anything to clean optical surfaces. Start with a blower, then a brush. If it's still dirty (as in the case of fingerprints, etc.) then a fresh lens tissue and a drop of Formula MC or ROR will do a great job cleaning it.

If it's not a CPL, just a UV filter - you can wash it in the kitchen sink with warm water and a drop of dishwashing liquid. Follow up with a rinse of distilled water if at all possible and sling off the excess to dry, on-edge.

I just clean my UV filters with normal tap water and soap. Works fine. Don't do this for CPLs though!