Going through a roof vent I only did once as the vent terminal could be either a stack vent or a vent stack
Some "roto" companies offer 6 weeks training for sewer or drain cleaning which is Ludacris
Possibly all THREE over 40 yearsso-called plumbers did the same thing and tried to snake the kitchen waste line
Insanity is doing the same thing over and over and expecting different results
Kitchen sinks and washing machine waste are notorious for grease and soap film build-up and this is what a water Jetter was designed to clear (soft stoppages)
The school of music in Manhattan had chronic roof drain stoppages from the late 1960s the MORONS they called all tried snaking from the roof drain and all these times they failed... Think about that
All the "rotor" guys spend decades trying to get this one drain working
What I did was told me employee open the wet column and see what they find
Seems the original p[lumber installed a test tee as required by the code BUT they never removed the bushing inside so the 4" line was reduced to 3/4"
Once we removed the test tee and installed a proper cleanout tee with an access door problem solved.
It only took over 40 years for someone to figure not to keep doing what other imbeciles did