Reading the manual on a 10-year-old Bosch dishwasher revealed the drain pump filter should be cleaned monthly, not yearly | Appliance Repairers - Rigidtalk
Read somewhere that dishwashers actually have a whole second filter screen inside the bottom that people never touch. @williamh48, totally agree on the lint trap thing. I missed cleaning the little metal mesh screen inside my dryer vent once and the thing started taking three hours to dry a load. Felt like an idiot when I finally pulled it out and it was caked with years of gunk.
What about the furnace filter? I went two years without changing mine until the heat stopped working. The repair guy showed me a brick of dust and fur.
Wow, that reminds me of the time my old washing machine died because I never cleaned the lint trap. What's the weirdest maintenance thing you've missed?