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I prefer any foam filter I can just wash, dry, re-oil, and replace. Those tend to get cleaned the most often. I just pick a hot sunny day to do it. An exception is when the new air filter is inexpensive such as with the Grom, where a new paper filter is under $10. As far as the best material, I can't say, but some very expensive bikes come with paper filters. I have always thought K and N filters were over-priced and their cleaning and oiling kits both over-priced and something of a sales gimmick.