We recently had our sewer main cleaned and videoed to solve an "annual"
plugging up problem. The tech said our main "dipped" a little from 5 to 14
feet out from the house. The tech suggested a regular regime of vinegar and
baking soda to soften and clear the culprit (soap-grease) as well as
flushing a tub or two of hot hot water. Does baking soda and vinegar
actually do anything? Is there something stronger I could dump down the
clean out every couple of months? How do others deal with this problem?