When you're using a K&N filter combined with their filter wrap you get the following steps working for you.
First the filter wrap is a not to dense thick foam oiled with their filter oil.
Not to dense foam cuts up the airflow and the filter oil traps the smaller particles.
Second is the oiled K&N filter itself.
Woven and pleated cotton fibres provide some filtration.
Woven steel mesh provides heavy particle filtration.
Everything oiled in with the filter oil traps most fine particles.
Again most of the times I only need to wash and re-oil the filterwrap.
And clean out the round OEM air filter box, most of the bugs end up stuck to the side of that air filter box.
The standard Toy filter box creates a cyclone effect, so I spray the inside with a little bit of DWX31. Anti-rust and traps the bugs.
Same as stated above the dirtier the filter you are pulling out during service the more you want to do cyclonic prefiltration of the airstream. So you're air filter isn't working as a muck catcher, but rather as a fine particle trap.
Oh and turn that horrid muck sucker snorkle on your rig backwards.
They only provide extra induction when travelling at speed, and greenlaning isn't a speed thing. So you want it backwards preventing mudspray from the guy in front entering the air induction system.