Having a clogged drain in the bathroom is not one of the prettiest sights. First, it starts with water that doesn't drain as fast as it should from the tub. Then the odors begin to rise from the drains and then one day, it is completely blocked. Cleaning out any clogged sink isn't rocket science, you merely need to know what to do.
Use boiling water.
Use baking soda and vinegar.
Use Caustic Soda.
Using a chemical remover.
Please remember that preventing clogged drains is the best way to deal with clogged pipes. If the blockages persist, reach out to a plumbing professional for help.