Pour it down the shower and sink drains to. I mean they smell HORRIFIC.
If so you most likely have a mold problem or the sewer gasses are leaking into your home from the drains.

Why do my bathroom sink drains smell. Typically when they start smelling we pour. Sometimes the bad smell coming from the pipes can be caused by the build-up of waste residues in U-bend. Think of the odor as a warning sign that something in wrong with your drains.
An effective solution to eliminate unpleasant smells from the pipes is to remove the U-bend pipe once a month and clean it thoroughly before reassembling. First check for clogs. This is the fastest problem to fix because all youll need is a bottle of drain cleaner from the supermarket or hardware store.
If your sink smells like sulfur the culprits behind the smell can be unused drains or contaminated water and pipes. Contaminated Sink Drain Grease fat food hair and skin oil can all build up over time in your sink drains and create some unpleasant smells as bacteria develop and the food rots. Basically the bathroom sink smells like rotten eggs or sewer due to hydrogen sulfur gas produced by the bacterial activities or by the decaying of trash in the sewer.
This may also be a sign that your drain is not properly installed and or the lead seal around the drain has failed or become rotten. Clogged or Blocked Pipes and trap If your pipes and p-trap are clogged this can cause a build-up of food and water. Sometimes dried P-trap clogged vents blocked drain also makes the bathroom sink stink like sewer or rotten eggs.
When the water drains particularly from the washing machine the sink drains throughout the house start smelling. The second thing that can be done is to pour cup of baking soda into the drain and then pour cup of vinegar into the drain. If the smell is coming from the water flowing from your sink and not the drain there is probably something in the faucet causing the odor.
If the sewer smell in your sink is caused by a blocked air vent you may need professional assistance. A smelly bathroom sink drain is a common problem as odor residue and bacteria accumulate regularly in the drain. Bacteria buildup in the pipes and faucets can release hydrogen sulfide gas aka sewer gas.
Even though you cant access this pipe as easily as. This gas can cause the water in the faucets to smell like sulfur or rotten eggs. When sinks are clogged they drain slowly and bacteria can build up in the p-trap and create the hydrogen sulfide gas.
The first thing you can do and the most simple is to remove any type of stopper from your sink or drain and clean it. This is the pipe that connects the drain to the piping that takes the waste away. Luckily keeping the drain clean and odor-free is a fairly easy task and requires only a couple of inexpensive household ingredients.
The most common is a clogged or partially clogged drain. Take off the aerator cap. If you notice a foul odor coming from the overflow pipe in your sink the pipe is probably harboring a layer of gunk and a colony of bacteria.
There is a possibility that there is debris lodged in the stopper that is causing a gross smell. The smell in a funky drain can have several potential causes.
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