What causes a sink to gurgle when draining? When the tub or sink is draining, the sink will gurgle. It didn't do this before and we are not having a problem with the drains as of yet. We have lived in an old rental home for a few years. I have cleaned the drains to both the tub and the sink using the baking soda and vinegar method. I normally do this on occasion. Should there be a concern? Thank you.
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