Pull out leaves, mud, and twigs by hand or with a small trowel. Dispose in a bucket or bag.
Create a seal over the drain opening. Plunge vigorously for 30 seconds. If water recedes, you’ve broken the clog. Run water to confirm. unclog outside drain
Stick the hose as far into the drain as possible. Turn water on full. If water backs up quickly, the clog is near. If it drains slowly, the clog is deeper. Pull out leaves, mud, and twigs by hand
Feed the snake into the drain until you feel resistance. Crank the handle to break up or hook the clog. Pull out debris, then flush with water. Plunge vigorously for 30 seconds
If water still pools or drains slower than 1 gallon per minute, the blockage may be in the main sewer line or caused by collapsed pipes.