The reason I don't like white rabbits is the pee factor. This seems worse in the boys.
Propecia is about 5 months and started to spray with a vengeance. I clean out the inside of cages about once a week- but I started doing his daily. This helped some - but he was looking like a red pearl.
I asked on a facebook groups and was told by other breeders to use vinger and cornstarch. It helped- but not much.
Someone elese suggested hydrogen peroxide- which worked remarkably.