Since puppies like to re-urinate on top of lingering scents of urine, when you go to clean up the puppy room, only clean any actual on - the - floor accidents. (schnauzers-rule.com)
There may also be a problem if the color or scent of the urine has changed. (modernmom.com)
This mixture gets rid of the scent of urine or poop, so that the pet doesn't feel the need to «mark» that area again. (simplypetsmagazine.com)