Washer, dryers, and washer/dryers have lint traps here. Now, obviously I knew about the ones in dryers, but I never even considered there being ones in washers (because there aren't in the US...at least not to my knowledge...and I literally grew up in an appliance/furniture store!). DH and I bought a washer not too long ago and it wouldn't drain. I freaked and he said, "Have you cleaned the lint filter?" Well, um, no, I didn't because I didn't know such a thing existed!
Of course, looking in my washer's manual, it says to clean the filter after every load. Huh? Haven't cleaned it since we cleaned it when the thing stopped working (and won't clean it until it stops working again).