What LA Sanitation says about grease and roots
LA Sanitation says more than half of sewer backups are caused by tree roots and poured fats, oils and grease. It describes how the grease builds up: poured down household drains, fats, oils and grease cool, solidify and stick to the inside walls of sewer pipes, and over time the buildup restricts wastewater flow until it eventually causes sewer overflows in homes.
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That layer on the inside of the pipe is the buildup hydro jetting is meant to remove. When an accessible line is in a condition to take it, high-pressure water scrubs grease and sludge off the wall, and it can clear certain root intrusion. LA Sanitation's advice for the kitchen is to keep cooking grease out of the sink and the garbage disposal altogether: scrape food leftovers into the trash, and pour cooled grease into a sealed container in the black trash bin.

