Propane contains an odorant that gives it the sulfuric smell. It is added to facilitate leak detection since propane is odorless. This odorant can separate from the gas and settle in low places as an oily, smelly liquid. Blowing out the lines (and perhaps purging the tanks of liquid) could help and won't hurt.
If the liquid is coming out of the regulator seams, I'd suspect the tanks and the lines between the tanks and the regulator.
I had the liquid in my copper lines from the regulator. I didn't do anything other than lower the ends I was working on to add my quick disconnect for the grill and let the liquid drain out. Due to a regulator malfunction I also replaced it and the tank lines.
“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins