If your cat or dog pees on the floor or shelf, take some peroxide and baking soda. Mix it and spray it on the spot they pee and it will turn white. That's where they peed.
Source: a friend that deals with stray cats that are rescued in a shelter
Be careful about using the peroxide on carpet. Do a small test where it won't show in case it discolors. Wait about an hour or more to make sure it will be okay because sometimes peroxide takes a bit of time for possible lightening effects.
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