If the sink fills up with water when the dishwasher empties, then that drain may be blocked and by all means pour Drano down the sink. But don’t pour it in the dishwasher. It won’t do any good and it may harm the pumps and seals.Click to see full answer. Beside this, what can I use to unclog my dishwasher?If your dishwasher drain is clogged and causing water to back up, you can try using a homemade solution of vinegar, baking soda and hot water to break up the clog. First, pour a solution of baking soda and vinegar down the basket at the bottom of your dishwasher.Beside above, how do you clean a dishwasher drain line? Method 2 Unclogging the Drain Remove the bottom rack from the dishwasher. Unscrew the drain catch and filters. Use a straightened wire hanger to remove the clog. Pour a baking soda and vinegar mixture down the drain. Let the mixture sit in the dishwasher for 10-15 minutes. In this regard, how do you drain a dishwasher with standing water? Remove the standing water as best as you can. You can do this by lining the floor under the dishwasher with towels and scooping the water out with a large cup, ladle, or plastic container. Make sure you put a large bowl in front of the dishwasher to empty the water into. You can also use the sink if you’d like.How do you unclog a dishwasher that won’t drain? If your dishwasher isn’t draining, try the following: Check the pump seal. Check the dishwasher door. Check the cycle. Check the electrical source. Check your dishwasher drain hose. Check the garbage disposal and drain. Check to see if you have a clogged air gap in your sink.