The best drain cleaners can improve your piping system’s water flow at home or in the workplace. Usually, the common cause for clogged and sluggish drains is the build-up of soap scum, grease, hair, or bath oils. That’s why you can use a solution or a machine to eliminate these undesirables. Most of the chemical compounds require a few hours or less for effective results. The following are the best drain cleaners in 2021.