Yep thats basically it. for now nothing too drastic, you can keep them under control with good hygiene and occasional soaking, that buys you as much time as you need to get provent-a-mite. and then its easy, provent a mite will just eradicate them while being very safe for the snake.
EDIT: another thread reminded me... if the snake doesnt like the water or freaks out, take her out, dont force it. generally they are quite relaxed in water, if they are not, maybe something is wrong.