Thank you for all the replies. I will ask about hydrojet cleaning cost.
I am considering the following two options. Appreciate your suggestion!
1. We do not have a cleanout point, and the only main access is on the roof.
To help cleaning up the pipe, would you think adding a house cleanout
access point without changing the pipe be good enough? The cost is about 800
~1000.
2. Changing the pipe costs about $4500 including all permits and
installation of 2 cleanouts to the property line. Does that seems reasonable
? Thanks.