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Pour in half a bottle of white vinegar, cover and let it simmer overnight. Then fill a large sink with water, pull off the lid and rinse down. That's what I heard from a friend.
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Tighten it with a wire protection pipe (a thin kind of pipe), poke it back and forth from a straight place, dig the ground when it encounters a turn, remove the joint, and poke it again, otherwise it will not be good if the pipe falls inside.
It should have little effect, and it is recommended to use a hand-cranked pipe dredge to dredge.
Mr. Vermeer has a good degreasing effect, you can try it. >>>More
Boil some boiling water and flush it down, and it will be clear in no time!
What to do if the kitchen drain is clogged with oil and difficult to clean, this method can be used to clean quickly.
Rinse with hot water and dish soap, and stir with a professional spring rope that dredges the sewer, preferably while stirring. Soon it will be fine.