There are a variety of options to use in place of carpet shampoo. Baking soda is an effective and natural alternative that can be used to deodorize carpets, while white vinegar and water can be used as a cleaning solution. For tougher stains, you may want to try using club soda or hydrogen peroxide mixed with dish soap. Additionally, there are many commercial products available for purchase specifically designed for cleaning carpets. Be sure to test any product on an inconspicuous area before using it on the entire carpeted surface.