I need parent-hacks for thrush treatment!

I have nystatin from the doctor and I have very well cleared up everything in the front of her mouth but the back part of her tongue and roof of her mouth---I need a new strategy!

The bottle says to put a syringe in each cheek, the doctor said if that doesn't work, try to put the medicine on a gauze pad to hold it in place a little longer. I am terrible at that.

How did you get the medicine to stay in place? How did you get rid of baby thrush?