Holy crap I pulled the washing machine out from the wall (because I want to start painting) and well, I haven't done that since I lived there, that's 8 years I guess and CRAP there is a lint/cat fur/dust creature back there and under there like you wouldn't believe. Disgusting.

so yeah the moral of the story is that you should really check behind your washer/dryer and maybe give it a clean sometime or if you don't plan to move then don't worry about it, I wouldn't have otherwise either.