You will need to be familiar with the winterizing process anyways, and that would be the same as the descaling process. Disconnect the quick connect from the fresh tank hose leading to the machine that runs under the hose reel and drop that hose and your chemical draw hose into a bucket of descale acid solution and cycle that for a while. I have only done this once, a few years ago, and didn't flush this out adequately and on the next cleaning job I put down a solution that turned the beige carpet blue. Another fine mess.