Wearing heavy-duty gloves, manually remove any accumulated leaves, mud, or food waste from the drain entrance and place it in a bin bag.
For an outside kitchen drain, remove the grate, scoop debris, then use a drain rod or pressure jetter . Boiling water or baking soda/vinegar is a good first try for grease clogs. Avoid chemical drain cleaners (they harm pipes and the environment).
Use a garden hose to see if water flows at all. If it backs up immediately, the blockage is deeper in the pipe. 2. Using Drain Rods for Stubborn Blockages
Outside drains collect leaves, dirt, and debris.