A couple of times recently, I've been so flabbergastingly disappointed with a product, I've wanted to tell other people, to save them from the same pain. So I thought it might be useful for us to have a thread, where we could all share this stuff.
I'll start...
Charles Worthington Everyday Gentle Weightless Conditioner, which should be renamed Useless Conditioner. I had high hopes. It promises to stop fine hair from getting bogged down with heavy conditioner. The trouble is that it also doesn't condition or do basic detangling. My DP (who has a hearing problem) could hear my hair breaking when I was brushing it after using the conditioner. That bad.