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@adrevporn
I do maintenance for some landlords and although I hate the stuff they would regularly chuck caustic soda / acid / similar nasties down the kitchen sinks to prevent this exact issue. if the washing machine and sink are on that drain and there isn't a lot of 'slope' then its often sitting water that seeps out.
Be careful if you have iron pipes somewhere and the chemical create poison gas clouds and the local sainsburys has to be evacuated.