Dog urine

What type of cleaning agent are you using?

What type of carpet are you cleaning?

Can't be of much help if I don't have any info to start with

It is possible that you will not be able to completely remove the discoloring.  Especially when the urine spot has been there for a long period of time and it is on a nylon carpet(sometimes customers just let things go too long).  If urine is left for to long some of the color will eventually get set into the fibers.  When this happens it will be near impossible to extract all of the coloring from the spot because it has essentially become a STAIN.  You would have to use a more "Harsh" and "Risky" method of removing it which would mean some kind of spotter that reallies on a chemical reaction to change,remove, or destroy the color.  Of course this also means that you run the risk of taking the original dye out of the carpet also leaving you worse off than you were to begin with(and remember most carpet fiber doesn't start out white before manufacturing).  So if it were MY customer and all but a slight discoloring still remained I would explain the risks of trying a different method of removal and let them decide whether to leave it be or not.   

Make sure your spotting agent is leaning towards the acid side of the Ph scale or you will have a heck of a time trying to get it out.

If it's on a polypropylene carpet than you're probably just using the wrong cleaner(normally it will come out with just ordinary carpet detergent and some elbow grease).  This particular carpet won't hold a stain because of the way the dye is introduced into the fiber during the manufacturing process.

Edited by Ryan

Sometimes you just can't get the yellow out 100%.

Sodium Perborate - this is a mild oxidizing bleach.
Hydrogen Peroxide - this is also an oxidizing bleach.

You can purchase products with these ingredients blended into them or purchase them in their own form.

Edited by Carpetologist

Ted is absolutely right on the money, I would suggest Sodium Percarbonate. You would have to purchase this from a raw chemical supply house, find one in your area and ask for a sample they will give you about 2 pounds of it. That should last you 5 years as long as you keep it in a dry place. If you still never got that stain out send a message here with your e-mail and I will contact you and send you some of what I have by mail.

   jack from Montreal      aka    NIGHTRIDER

nightrider wrote: If you still never got that stain out send a message here with your e-mail and I will contact you and send you some of what I have by mail.    jack from Montreal      aka    NIGHTRIDER

Getting that mysterious whit powder in the mail should remove many stains inclusing the one when you sh*t yourself when thay take you to jail.

NightRider........I don't think that stuff is on the prohibited list of things you can send thru the mail. However, I highly suggest that you check with your local postmaster just to make sure. If it is prohibited and you mail it and get busted.....you can bet your balls that your gonna go pay a HUGE FINE and possibly go to jail. He should be able to get that stuff here in the States with no problem. Most any cleaning supply place will have it and if not, then he can certainly get it at the farm supply store.

TRY THE URINE SPOT REMOVER BY PROSCHOICE DOES A GREAT JOB SPRAY ON WALK AWAY 3-8 HOURS LATER GONE .WWW.PROSCHOICE.COM OR CHECK THE NEAREST DEALER.

Butane?