How to Clean Ketchup, Pasta Sauce, or Barbecue Sauce off a Carpet

1. Gently scrape away the excess sauce as soon as possible after the stain sets. Use the dull edge of the knife, and remove as much of the ketchup as possible.
2. It's essential to use the right stain-removal techniques for a type of carpet. For example, natural fibers, such as wool or grass, can react badly to liquid stain removers (see the warning below concerning these chemicals), and you should always think twice before cleaning antique carpets or valuable rugs. If in doubt, call a professional carpet cleaner.
3. Dry stains need to be prepared for cleaning, so simply moisten a clean cloth with warm--not hot--water, and gently dab it onto the stain.
4. Prepare the cleaning solution. Add ¼ teaspoon mild detergent or carpet shampoo to 1 liter of cold water. Stir the solution in a bowl to mix thoroughly.
5. Moisten a clean cloth liberally with the cleaning solution, and simply lay the cloth over the stain.
6. Then dab it with a clean cloth.
7.Spray warm water onto the stain.  
8. Blot the stain with a clean dishtowel or sturdy paper towels.
9. Let the carpet dry.