Sick of cleaning carboys and kegs? Who isn't right? Soaking for days is a PIA and doesn't always work. Here's a carboy/keg brush you can build yourself for about $8. This is prototype III and I think I'm on to something with this one:
+1... You don't need to soak for days though, try 15-20 minutes with Oxyclean... carboy brush will take everything and anything off.
If it's working for you though... awesome. I'd suggest maybe some felt around where the pvc might come in contact with the glass.... I know it's hard to scratch the glass, but if it's spinning at high RPMs, who knows.
Thanks for the comment. It tends to center itself when running. The PVC shaft did hit the sides of the opening a few times. No scratches. I don't think the PVC is hard enough to scratch the glass given that it's plastic. My problem with soaking has always been the fact that I need to fill the carboy up with liquid. Then, to use the recommended amount of cleaner gets expensive fast. With this approach. Only a quart or so of cleaning solution is required saving a lot of money. The time to clean a really dirty carboy is around 20 seconds.