Running our Piglet highbanker with Goldhog mats, and testing frequently, we found that if it was just a short shutdown and the mats stayed wet, we had no blow out on restarting. If we took a long break and the mats dried out some, we could lose a little bit on start up, but not much. We just throw a Garrett Super Sluice pan on the end when we start back up and throw it back into the system. Otherwise we clean out when we're done, which for my wife and I was about 3 hours of constant digging. A lot of you probably can dig longer, lol, so maybe a couple cleanups? I agree with Reed though, the GH mats don't leave you with a ton of cons, so clean up when you feel you want to.