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Unclog drain that both sinks drain into.
The foul odor in one bathroom could be due to a clogged drain, mold/mildew buildup, or a malfunctioning wax ring seal around the toilet. Check for these issues to identify and address the source of the odor.
Pee in the drain or sink! n00b
you can try cleaning the sink out with bleach.
If it's a sink drain , best to remove the entire pipe and P trap. I then take outside and hose them out.
If you have a stink coming up from the overflow drain in your bathroom sink, you have some garbage down there that you should not have. You probably have a lot of hair clogging the drain. It is probably slow draining. You need to clean it out and get rid of the gunk.
Carefully as not to cross thread the CO plug
Product you should use when trying to unclog your bathroom sink are products like drain-o. Drain-o works the best in my opioin. When you buy off brands they do not work as well.
Teflon paste and quick wick
standard size for bathroom sink drain is 1-1/4 standard size for kitchen sink drain is 1-1/2
The best option is to purchase a sink strainer to place ontop of the opening to the drain. This will prevent hair and soap and dirt reside from staying inside the drain.
Yes a clogged VENT pipe can cause a sluggish drain