Grease does not coat a pipe evenly and leave; it builds a rough, narrowing lining that grabs everything passing through. A cable punches a hole through the soft center - full flow returns, applause, and the hole begins closing the same week because the lining that caused it is untouched.
Jetting is the mechanical answer: high-pressure water scours the lining off the pipe wall and restores the full diameter. It costs more than a cable visit and less than three of them. The decision rule is simple: a kitchen line on its third clog is a jetting candidate with a camera chaser.
Prevention is boring and effective: grease goes in a can, not the sink; the disposal is not a trash can; and a monthly kettle of near-boiling water down the kitchen line slows the lining's return.
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