Hi! Nice to meet you! I'm faith! I have only one Chinchilla, named Lucy!
Your so lucky to have 5 Chinchillas! I visited your you tube account! Super Cute!!
Wow!! you guys are creative! my chins name is just Lucy. I call her Lu, lilla, or mouse ( if shes being bad). However the rest of my family calls her poop machine gun.
Here follow this link, it might help
https://answers.yahoo.com/question/index?qid=20090311232853AAr6aQP
I did this and after about a week my chinchilla stopped peeing every were and only went in her litter box.
Good Luck!