Here's probably the easiest and simplest way to get out a pet stain and something that everyone has around their house. Get some laundry detergent and mix some water with it. Put the mixture on the stain. Let the mixture dry overnight or for a few hours, depending on how deep the stain is. Scrape off the mixture as much as you can and then scrub and rinse it until all the soap is gone. Let it dry. If the stain still hasn't come out you can try this again or try some of these other methods.

Other products to try are carpet cleaners, especially the Resolve brand. Other brands work too but Resolve usually works the best. Oxy clean works, Woolite Oxy Deep works, and I've even found that Windex works. Most stores carry "for pet stains" versions of the cleaners so check before you buy the normal version. But before using any of these methods try a small spot on your carpet where no one sees, like the back of the closet, so if your carpet has a strange reaction to the cleaner you won't have to replace your carpet.

Using steam cleaners on your carpet often leads to the urine stain and smell being permanently in the carpet so avoid them! To see old urine stains, try using a black light bulb. They will help you check to make sure that you got all of the stains.

When your pet has an accident on something that is washable try using a one pound box of baking soda. It helps to neutralize the odors. When your pet has an accident try to get to the stain as soon as possible. The longer it sets in the harder it will be for you to clean. Remember if the stain doesn't come out the first time, just keep trying and trying. If it doesn't seem like you are getting anywhere, take a picture of the stain. Then when you are done trying to get it out, compare the picture to what you see in front of you. It will probably be slightly different but even that means that what you did worked and that you should keep trying and eventually it will all come out.