This advice would work fine for an exhaust fan purchased as an exhaust fan. We are a bit more… creative. This is a little 10 inch box fan that we crafted a housing for and put a piece of screen into then jammed it into a hole cut in the wall above the toilet.

We live in the middle of the bush so bugs are a big problem if we don’t have screen on every nook and cranny.

As such this is easier to clean with a qtip than a brush.