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So you don't actually clear the drain line from inside the dishwasher. You must uninstall the dishwasher to access the drain pump below the door. Then you can access the hose going to the pump as well as the hose between the drain pump and wherever it's draining to under your sink. If you flip the circuit breaker off to the dishwasher and open the door, there are screws either going into the side trim or up into the countertop that hold the dishwasher in place and you'll need to remove those screws. Now every install is unique so the dishwasher may just pull out at that point or you may need to remove the kick panel below the dishwasher and disconnect the fill hose or the power cord or something like that to pull the dishwasher out all the way so you can work on it.
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There are no videos that I know of unfortunately.