Peeing white paste

Question
Hello,

I have been seeing this white paste in my rabbit's cage? is this good or bad? should i be worry?

Answer
By what you are describing, it sounds like the calcium buildup that happens when rabbits urinate. If the bunny isn't acting sick or unusual, then this is probably it.
A tip for cleaning this is vineagar/water mixed. This also helps to remove urine odor.
Samantha