oh wow.....those are extreme conditions man, that dirt is like a fine powder......YOU MUST be dialed in the airfilter area when running in conditions like that.......from here on out, MAKE SURE the filter is oiled well, OUTER AND INNER, and you should replace probably after each day of running in places like that.......dont even bother attempting to clean them, just toss them in garbage and replace with fresh assembly......cheers!