ac in rat shed

i have a small ac which can keep my shed to 85 in 105 temps where i live! but my problem is the dang thing always clogs up because of the ammonia in the summer when being used heavily. is there any way to prevent this?
edit: i thinks its because of ammonia, im not 100% on that though

Get a window fan, open some windows! Rats are really low maintenance them pasture wise, as long as the room doesn't overheat. Could you just put a screen in the door? Several rats will pile up and stay warm if it is cool...

i have two fans that pull the cool air through the shed to vent

Not much you can do with the AC...Change the filter as much as possible...You can also take a wire brush and shopvac to it...I buy 2 new ACs every summer! Sometimes they don't even make it through 1 the summer!

Keep an eye out on Craigslist for good deals on ACs in the off season and stock up!