We've recently been having trouble with our washing machine drain overflowing, or perhaps we've only noticed it recently. The washer is 2 years old, the house 23 yrs. The laundry room is off the kitchen, the drain from the machine is flexible plastic, going up the wall into a pipe that slightly extends from the wall. We can usually hear the water draining just fine, but occasionally it will overflow at the wall pipe. It seems this may be happening only when a kitchen drain (either sink or dishwasher) is also running, but we aren't sure of that. Other than trying the peroxide drain cleaner (found info in archives on Google) is there anything else we can try. I know the obvious of don't use both drains at once, but other than that....
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