The  fishy smell in bathroom is quite unpleasant, and it usually means that you have a serious plumbing or electrical problem. Some people may attempt to resolve the issue by simply cleaning the area, but if that does not work, it is time to call in a professional to find and repair the cause of the problem.

One of the most common causes of the fishy smell in bathroom is a sewage leak. It may be due to a broken toilet seal or a blockage in the plumbing vent. The odor of sewer gas often smells like fish, and it can be difficult to get rid of it.

Another possibility is a dead rodent in the drain. If you have a pest control company come in to take care of the dead rodent, it should eliminate the foul odor and prevent future infestations.

Occasionally, the smell of fish in the bathroom may be caused by a bad case of bathroom mold. This can be hard to remove, and you may need to replace the drywall.

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If the smell of fish in your bathroom is due to a dirty drain, try using vinegar or baking soda to clean it. Baking soda is a quick-dissolving deodoriser that also helps to clean clogged drains. It is best to use a cleaner that is safe for pipes and septic systems. You should also make sure to dispose of all garbage regularly. Finally, you should improve ventilation in your bathroom by opening windows and using fans to dry the air.