I bought a 100 foot long pressure hose, a metal spray nozzle, hooked the hose to a borrowed pressure washer, and pushed the hose down the service line. When plumbers do this they can run a camera to verify the location of the clog before hand and then run the camera afterwards to verify they cleared it. But I refused to pay the $1000 the plumber wanted to charge me and just took my time working the line with spray nozzle back and forth for about 15 minutes. Line was successfully cleared. Total cost about $150