Don't be hesitant about gentian violet and vinegar washes!! Check out www.kellymom.com or www.drjacknewman.com to see the exact instructions on how to use it.
Thrush is EXTREMELY tenacious!!
When baby is nursing, use gentian violet... after the nursing session is over, wash nipples with slightly watered down vinegar and allow to dry. You have to coat both the nipples AND the baby's mouth with gentian violet. You can also coat the mouth at anytime with gentian violet - whether nursing or not... just be careful of the beautiful purple color staining fabrics.