There are a few homemade carpet shampoo recipes can help with odor elimination. If you want to try to make your own carpet shampoo odor killer then the best product to start with is baking soda. Baking soda is commonly marketed as an odor neutralizer and people have been using it to kill odors in their refrigerators and freezers for years. The method of odor neutralizing employed by baking soda is pH buffering. Odors are typically acidic or basic in nature. Whenever odor particles encounter baking soda it neutralizes the extreme pH and as a result eliminates the odor. Another common home remedy for odor neutralizing is hydrogen peroxide. Hydrogen peroxide works by killing the bacteria that causes odor. A combination of hydrogen peroxide and baking soda makes a paste that works extremely well against urine stains and mildew odors. That is why it is a good cleaner for large bathroom rugs.

Some commercial carpet shampoos utilize encapsulation as a means of odor neutralization. Febreze for example, is made of molecules that have inner pockets that are very attractive to odor molecule s. The odor molecules find their way into these pockets and then are encapsulated by the Febreze molecules. Then, the odor molecule is released when the Febreze molecule is engulfed with water. This is why Febreze is so good for clothing that you can put into a washing machine. However, it is not a good choice for carpet cleaning. Another choice is dry foam carpet shampoo that works on this same principle and is then vacuumed away. One thing you want to be careful of with odor neutralizing carpet shampoo is shampoos that contain perfumes. Sometimes these perfumes will just cover up an offending scent instead of actually negating it. In addition, the perfumes could react with the existing odors in unattractive ways and you might end up with an odor worse than what you started with.