Help with clogged kitchen sink

[JC522]

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Checked the drainage pipe from the sink in the basement if basement is not developed and find the access port and remove and snake it usually plugs at the bends with grease and sludge. When removing the the square access cap or snaking the pipe water may shoot out ( due sink and lines still holding the water) and smells terrible and extremely dirty so be prepared.

How far is the access port? I can see where all the drain pipes go into a main pipe and down into the concrete basement floor.

Went over today and saw my dad using some sort of snake that connects to a power drill. He got to about 25 feet from the p trap before pulling the snake up and calling it a day.

[TYMSMNY]

I've got a battery powered ones w/ foot pedal at 50 ft. and has cleared restaurant lines. The drill snakes are ok, what bit are you using on the head of the snake.