My A/C drain line appears to be clogged and is causing the unit to overflow the drip pan and flood the garage. Anyone know how to clear the pipe? Its attached to the air handler and makes a 180 coming out of the unit before turning to run along the wall. Its PVC so I cant just unscrew it. Ive been thinking of either trying to run a pipe snake or a shop vac from the open end to break or suck out any clog. Is there a better way of doing this? I heard there was something that A/C guys put in the pipe to clean it, a solution or something. Anyone know?