Caramel is mostly sugar which will disolve in water. Wet, but don't saturate the carpet, let sit and then gently rub to the center of the spot with a white washrag. You may have to repeat a couple of times but it should all come out.
This is just popcorn coated with caramel? I have light carpet and I use a medium brush (not stiff, not soft) from the $ store. I dip the brush in a pail of water and brush. I may have to dampen the area with water from a spray bottle and let it sit a bit to penetrate the stuff but this works fine for me.
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