Only on the AC. Take it out and wash it.
If you need to replace it you can find that sponge filter material at a store that sells window AC units. Like WalMart.
Your filter should be located right on the A/C unit. There are 2 tabs to release the plastic screen. The filter is a black thin sponge like material. Just use hot soapy water, rinse well and dry it out a bit before reinstalling. I bought this same type filter material at Home D and cut it to size for a spare filter.
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