Nothing is worse than fixating on a repair or chore that requires a lot of money to fix, but is not in the budget. I know for a lot of people stained carpet is a source of embarrassment when entertaining, and right now it is not possible to replace it or even spend the few hundred dollars for cleaning. I have listed below a great spot cleaning method for synthetic fibers (nylon, polyester, etc.). All that you will need is some elbow grease.
Step2 Add a dime-sized amount of dish soap.
Step3 Add a splash of white vinegar (distilled works best but others work too).
Step4 Add half a teaspoon of baking soda.
Step5 Mix together and scrub the mix into the carpet using a rag or scrub brush.
Step6 Let it sit for five minutes.
Step7 Use a dry rag to dab out the mixture.