Turn on your kitchen sink faucet to the hottest setting. Let it run until the water is scalding. Why? Because the dishwasher is connected to the hot water line. You want the hose to fill with hot water immediately to melt the grease before the vinegar hits it.
Wait—this is controversial. Most modern dishwashers have a stainless steel tub and a concealed heating element. If yours has an exposed metal coil at the bottom, vinegar fumes can corrode the coil over time. Check your manual. If you have an exposed element, stick to the "Disconnected Hose" method only. clean dishwasher drain hose with vinegar
Always consult your dishwasher’s user manual before performing maintenance. This guide is for general informational purposes. The author is not liable for any damage to your appliance. Turn on your kitchen sink faucet to the hottest setting
Rinse the hose with a garden hose or high-pressure sprayer in the sink. Water should flow freely. If you see chunks of gray slime fly out, you have won. Because the dishwasher is connected to the hot water line
If the method above didn't solve the problem (i.e., you still have standing water), you have a solid clog. You need to get physical.