It's definitely worked for me as well. I forgot what the vinegar to water ratio should be, but I try to keep it 1/2 and 1/2.
Alright, so my birthDAY is pretty much over, so I decided to fool around with my half dead camera! The red is washing out of my hair but I still like the colour. I'm contemplating dyeing everything back black/darkish brown for the new year, but I'm not 100% sure yet.