I have an 80 years old house. We have to use snake to clean the sewer pipe under basement ground every 6 months. After we hired somebody to do a vedio inspection in the sewer pipe, we found that over the time there is a thick layer of grease built in it that made the pipe becomes very small and therefore, very easy to trap waste and more grease.

Is there a way that we can do ourselves to clean out this thick layer of grease?