Here are some helpful URLs… for many cat questions:
read about “cat spraying” and litter “box problems”
Interesting, to find out if all cat urine is gone, use a black light
three things to remember when cleaning up cat urine:
1) NEVER use ammonia to clean up urine because there is ammonia in urine, which may make the cat want to come back and use the same spot.
2) Use white vinegar mixed with water and your favorite cleaner. White Vinegar: The VERY BEST odor remover!
3) Buy “OUT” (avail at Walmart for under $5) or another Enzyme/good bacteria cleaner at a pet store. I like “OUT” because it works and has a slight Vanilla scent. Spray “OUT” after cleaning area well with Vinegar and water. “OUT” has enzymes and good bacteria which “eat” up biologicals To get the most out of the treatment: Do NOT blow dry or use a fan because the longer the product is wet, the longer the bacteria and enzymes are “Alive” which means they work much better “eating” up the urine crystals. Clean, spray with “Out” then cover with plastic (to keep wet longer) overnight. You may repeat as many times as you need. The “Out” does not just mask the odor, it gets rid of it!