I've tried everything! My two girls are only. Couple of months old, but my mum swears that they will have to live outside if I don't sort this out FAST. of course, it's super cruel and I just won't let that happen!

I've bought them a litter tray (which they use), special odour controlling treats, clean their cage every day, bought a dehumidifier, cleaned the carpet (in case they were peeing on it) then put newspaper down. I blast their cage with vinegar spray every day when I clean them out, and blasting the cage with a hose doesn't seem to help either. ANY advice would be GREATLY appreciated, as I have no idea what to do anymore!!! I can't have my girls living outside in -0c!!!!

Thank you in advance :)