Bunny - the bleach and water solution kills just about everything - just spray it on and don't wipe off....or at least let it stand for a couple minutes. I just left it to dry. Instead of mixing a weak solution, you might try something like Clorox Anywhere spray - this is what I keep on hand.

When we were fighting ringworm this past spring, I finally scrapped the shampoos and oral medicine because it was just too traumatic for everyone. Instead, I bought the Program and treated everyone once and Emily twice as she was the one with the active ringworm.
There are two sites I found that I keep bookmarked are as follows:
Ringworm FAQ
Ringworm battle plan

This is frustrating but it will go away. It will! Good wishes to you my friend. (((HUGS)))