How do you get pasta sauce stain out of a carpet or rug?

Oxyclean is a good thing to use. There are also common stain removers if the stain isn't that set. Another thing to try is warm glycerol/glycerin (not hot) on the stain, then use cold water to spounge it/blot it out. If its a rug that can be washed, try a normal wash cycle on cool water. Air dry it, you do NOT want to cook it with unneeded heat Also you can try laundry detergent (gel ones). Use a bit of it on an unsightly part of the carpet and then apply it to see if any discoloration occurs. If not, then try a little of your detergent on the spot, wash it up and use cold water while doing it. If the unnatural fails, there is always light vinegar, baking soda and lemons as a mixture. Again, try this in an undisclosed part so you can check for discoloration.

We nurses swear by hydrogen peroxide. It gets out anything organic like blood, grass stains and etc. Tomatos are organic,so it should get the stain out! It has never failed me yet! Good luck!