I try to use a non toxic way to clean our cages and the best and most simple way to do this is with white vinegar and water. Buy yourself an empty spray bottle and fill it with 50% white vinegar and 50% water. You can clean wood shelves or any part of the cage with it. The best way to remove urine from wire is to spray it with undiluted white vinegar and let it sit for a few minutes. You can use a nylon or brass brush and even a scrubbing pad to remove it. You should clean the cage at least once a week. More often if you use a drop in pan style cage depending on how many chins you have. Remove all the litter and spray the tray with the vinegar/water mixture, wipe clean and add clean litter.