Sink won't drain. Removed U-bend, not clogged. Rotated right-angle bend upside down and able to pour water down. Live in a flat. Bathroom all works fine. Haven't tried dishwasher / clothes washer
Washing machine (right) and dishwasher (left) wastes connect to kitchen sink trap. It often smells when the washing machine is running, any ideas as to how I can stop that from happening? :
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