I clean mine with the same stuff as my foamfilter on my wr250r (just regular foam airfilter cleaner). The KN oil is speciel tho', but comes in a small bottle which oils a lof of filters.
For extended trips I dont bother cleaning filters, just keep a spare and change it. RTW stuff is different tho, but 20.000 miles and no filterservice seems quite good to me.
I'd think regular kerosene, or gas/diesel in a pinch should clean it all of, gas could be kinda hard on the filter. Havent tested tho'
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