I doesn't creep, it melts. Done it hundreds of times. Have a compressor and vacuum with the hose and fittings set up to do it. A pressure washer can be converted to work too but it makes a god awful mess.
Take an 1-1/2" pvc san-tee and a rubber reducer that will go from 1-1/2" to your pipe size. Then take an 1-1/2" gem cap and drill a hole in it large enough to push the flexible line from the compressor through. The outlet of the san tee gets adapted to the vacuum hose. I used a Fernco coupling but for one time use duct tape will work fine.