Recently I found a cache of old teabags in the back of my kitchen cabinets. These teabags were at least 3 years old and undoubtedly stale. Rather than throw them out, I have been brewing them, one at a time, letting the tea cool and using it on my hair as a rinse after conditioning. Not only does it clean and shine my hair, it also imparts a lovely fragrance.
Too bad I didn't know about that. I threw out some old tea. Another thing that can happen besides the tea being stale, is it can get buggy :-(
The boiling water will kill the bacteria (bugs?)