Using white vinegar and water, mix a solution in a bowl (50% vinegar, 50% water). You’ll want to mix enough of the solution so that it can reach deep down into the carpet’s fibers.
Pour the solution onto the urine stain. Using a scrubbing brush, work all of it deeply into the carpet, scrubbing vigorously. The vinegar should help to neutralize the ammonia in the urine.
The best products are Clorox Urine remover, for stain and odor, or Nature's Miracle, Dual Action Orange-,Oxy Power, just for cats. Both purchased at Home Depot. Aloha!
We have rental property and I have tried everything. If it is old and really through the mat into the flooring it is impossible. We took the csrpet and padding up, painted with Kilz specifically for odors and stains and put new carpet and padding. After about 6 months I could smell it again!!! I love dogs and cats and have had them all my life, but have never had a problem cleaning after accidents. I think the renters just left the urine for the entire 9 months they were there! Good luck!
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This site describes 3 different ways to remove old urine stains in carpet:
https://www.wikihow.com/Remove-Old-Dog-Urine-Stains
Using white vinegar and water, mix a solution in a bowl (50% vinegar, 50% water). You’ll want to mix enough of the solution so that it can reach deep down into the carpet’s fibers.
Pour the solution onto the urine stain. Using a scrubbing brush, work all of it deeply into the carpet, scrubbing vigorously. The vinegar should help to neutralize the ammonia in the urine.
The best products are Clorox Urine remover, for stain and odor, or Nature's Miracle, Dual Action Orange-,Oxy Power, just for cats. Both purchased at Home Depot. Aloha!
https://www.bedbathandbeyond.com/store/product/bissell-reg-little-green-reg-proheat-reg-pet-deluxe-carpet-cleaner/3349999?brandId=534&mcid=EM_Productcampaign_201811_NovemberCircular3_Offer&rid=537052402&S_HASH=94ec70536dfb3aa00d1c104befc7368345619540dfc826331ee53293f695c27b
Bed, Bath and Beyond: You can even use their coupons & it's free shipping. Maybe you can even put it on your list for Santa
We have rental property and I have tried everything. If it is old and really through the mat into the flooring it is impossible. We took the csrpet and padding up, painted with Kilz specifically for odors and stains and put new carpet and padding. After about 6 months I could smell it again!!! I love dogs and cats and have had them all my life, but have never had a problem cleaning after accidents. I think the renters just left the urine for the entire 9 months they were there! Good luck!