To find out if your clothes are getting a good wash, check the water temperature with a cooking thermometer (one that registers low temperatures) when you do a cold, a warm and a hot wash. If the water temperature is below 65 degrees for cold water washes, boost it by selecting warm water for part of the initial fill cycle. If the warm water wash is below 85 degrees (a common problem during winter or when the washing machine is at the opposite end of the house from the water heater), try the hot water setting instead for all or part of the wash cycle. Or run the hot water tap into the laundry tub until it gets hot, then turn on the washer.
Always leave rinse settings on cold, no matter what washing temperature you choose. Cold water rinses are just as effective as warm water rinses, and you'll save a lot of energy.
Stop Washing Machine Walk
Most washing machines have self-adjusting rear legs that level from side to side, but dirt, lint and rust may keep them from working properly. If the back isn't level, tip the washing machine up a few inches and then set it back down so the weight of the machine loosens the legs. If the machine still doesn't level out, the self-leveling support may be rusted against the washing machine frame. Tip the machine off the ground, then break the self-leveling support loose by tapping the legs.