I found a 5 gallon glass carboy that is difficult to clean with a brush. There is a scale or deposit inside. Is there something strong I might use to loosen it enough to use a brush? Otherwise, I may have to trash it.
fyi....once clean use 1oz white vinegar in 1 gallon water to wash off the oxy residue...
works for me. also if you sterilize at brew time with sar-stan it will remove the residue as well.
oxi-clean is a great cleaner but you should still sterilize with something on brew day.
go re-read what happened:one scoop of oxyclean free and poof! its clean too and some money will remain in your wallet. I use pbw for kegs but don't like spending the money on the glass fermentors. I do agree pbw works great! i just think oxyclean works great as well.