I'm a smoker, and with 2 dogs and a cat they can get like that pretty quick. Especially if you dont have a carpet in the room. I blow mine out 3 or 4 times a year.
Much easier to just use the exhaust end of a shop vac.
Im surprised that thing still runs. I know when mine is due for cleaning as my machine starts to beep once the cpu starts running warmer then I want it