Anyone have a magic method of removing urates stuck in cage corners?

Try increasing your bleach concentration in your bleach water. I bumped it up to about 1 part bleach in 20 parts water and with a short five minute soak it works much better than water or very diluted bleach water. It still takes some scrubbing though.

Old toothbrush! I used hte back end if they are encrusted to knock most of it off then the brush part to clean the wall after spraying the brush with F10. works everytime. I also use it on hides when that happens.