The best way to clean a tub overflow drain involves a cleaning agent made out of simple household ingredients. To make this cleaning agent, get out 1 part lemon juice to 2 parts baking soda. Mix them together thoroughly until they form a substance that looks like toothpaste.Click to see full answer. Also know, how do you clean a bathtub overflow drain? Baking Soda and Vinegar Slowly add 1 cup of white vinegar on top of the baking soda. The mix will foam up and move down the drain. Leave the mix in the overflow hole for around 10 minutes, and follow up with boiling water to flush out cleaner and help sanitize the overflow drain.One may also ask, how do you clean out a tub drain? Start by removing the screws on the drain’s overflow escutcheon plate. Next, pull the drain assembly out of the overflow pipe. Clean any hair and debris from the drain bail. A two-foot long flexible rod with tiny bristles on the end, known as a drain stick, is used to remove any additional gunk from the drain. Regarding this, how does a bathtub overflow drain work? The main drain is at the bottom of the tub and the overflow is a few inches below the rim. Both drains are connected to tubes which meet beneath the bathtub and merge into a single pipe. The main drain may have a plug stopper or a mechanical stopper operated by a lever, but the overflow never has a stopper.How do you unclog a toilet drain in a bathtub?Close the tub drain or have a helper block it while you plunge the toilet. Blocking the tub drain will direct more pressure toward the obstruction. Clear the blockage with a toilet auger if plunging has no effect. Insert the head of the auger into the toilet bowl and push until you encounter resistance.