Dryer: Dryer taking a long time to dry your clothes? Poor air flow could be the problem. Check the vent and duct to make sure they are not blocked up.

Washer: Check you hoses yearly. 

Manual: Read and keep your use and care manual. It has important warranty information that you may find useful in the future.  

Refrigerator: Condensers should be cleaned as often as air filters are changed for your air conditioning units.