Easy way to remove stains, even old ones. Instructions 1 Combine equal parts ammonia and water, or use Windex. If you use Windex, use clear or yellow solution. The blue solution should not stain the carpet, but watch it carefully. 2 Heat up an iron to the highest cotton setting. 3 Soak the stain with the solution of your choice. If the stain is large, work in small sections. 4 Place a white towel on the section you're cleaning. Do not use a colored towel, or the color may transfer to the ca...