pulled the air filter out of the gravely (kawa fx481 engine) and was freaked out by the amount of dust in the relatively new filter - they recommend changing every 250 hrs, this has maybe 25 hrs on it. I blew the equivalent of the simpson desert out of it with the compressor and decided to try wrapping a piece of chux superwipe around it....ended up doing it to the cox engine too and servicing everything else (was relatively cool in the shed)