You have an accident on your carpet and want to get it up. I do not recommend using something you buy from the store. These products tend to leave a residue that will attract dirt. Also, if it does not remove the spot, it could actually set the stain so a professional cannot get it out.
I recommend using white vinegar and water. Mix around 1/3 white vinegar to 2/3 water in a spritz bottle. then spritz the spot and blot it up with a white rag. Here is a link to a video that will show this process. Spot cleaning video
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