Here is what is working with my 4 Monsters
Bottle spray from the beginning was their enemy, so I dropped that idea.
What I do is buy plastic container- the same to keep frozen food- from a dollar store, I remove the top. Container is about 2 inches height and about 6x6 inches. You can try different size of course. I tried once with more deep container and they seemed to be scared- too deep for them.
I feel the container 3/4 of room temperature water and put it on the top of their cage. And here is the trick- if I put the same container somewhere else(playgym or another place they are going), they will not use the bath. Only on the top of their cage.
And they have a fun for about 20-30 minutes. I always do it with my supervision, to make sure nothing happened to them. And I do it the latest time is afternoon- it gives them plenty of time to dry before they go sleep.
All the males seems to love it, first goes mango(the boos) and then rest of males: Coconut and Plum.
Blueberry(female) doesn't seems interested at all.
Good luck!