You can give it a shot.
What I like to do is wipe down their cages daily with baby wipes, it makes the scrub down much easier. I'd give it a quick wipe down and try and add the litter box, see what happens.
Place all the little rat raisins in the litter box.
At three months old they should be a little bit harder to train than an adult, but it's doable.
Having that Super Pet Critter Litter helps a bunch too. You can find it online and sometimes at local pet stores. I tried a half dozen other litters and none worked like it does.
I've got my fingers crossed for you!![]()