I picked up used glass carboy and it needed a little elbow grease to get cleaned up. I soaked it over night with Oxyclean and used a brush on it. It came out pretty good, but there is some small areas inside that still have a slight deposit of very light colored residue. It looks like you would have to use something to scrape it off - a brush is not going to do the trick. Will it be OK to ferment in after proper sanitation? Any suggestions on what I could do to get the remaining residue off with?

I use trisodium phosphate (TSP). It's an industrial cleaner and an overnight soak seems to get rid of just about anything. A tablespoon for 5 gallons will do the trick. Cash and Carry sells it for pretty cheap. If you don't have a Cash and Carry in your area try a restrant supply store or a home improvement store.

Try this neat tool to clean your carboys. http://www.carboycleaner.com

Love the idea!

Hate the price!

But, I will certainly be making my own version of this soon! It's can't be that difficult to do.