suzie-uk
Sorry Ruth - Don't know about ACV for fugus but I do know that Tee Tee Oil and Grapefruitseed extract is great because I have used them both for that reason - mainly for my toes.
You have to get an emery board and file your nail down as low as possible and apply the tee tree oil ( I also added some grapefruit seed extract). If it is on one of your toenails- you should cut it down as far as you can and try and apply the "above" up and under your nail.
This has worked for me. Let's face it- it's a fungus and funguses hate grapefuiteseed extract and tee tree oil!
I also found that after I applied the oils, I put on an old pair of socks and let it soak in!!
Hope this has helped you
Suzie