You can use Dr. Drain Removers to unclog a kitchen sink, bathroom sink, shower or clogged bathtub, but DO NOT use them in toilets. For clogged or slow-running drains, apply the product and let it work 15 minutes, then flush with hot water. For tough problems, allow 30 minutes before flushing. Dr. Drain is an extremely efficient drainage cleaner which melts hard blockages of hair, grease and food waste out of your sink in only 15 minutes. Dr. Drain is a simple solution to tackle multi-clogging problems such as the kitchen sink, washing basins bathtubs, bathrooms and so on.