Be careful cleaning air filters. Most people use excessive air pressure that can cause damage to the filter media that cannot be seen. An air filter works the best with some dust load because the larger pores in the filter media become blocked. The media does not have a uniform pore size unless it is a high quality very expensive type similar to Hepa filters. Excessive cleaning of the filter can lead to the filter to become less efficient and lets dust through. Most earthmoving machines have a secondary smaller safety air filter inside the larger main air filter something that no 4x4 has so cleaning the outer filters is very common but is only done 3 or 4 times prior to the filter being scrapped.
The very fine dust is also a health hazard, it can lead to silicosis so keep the kids away when cleaning air filters.