I’ll bet you even have this carpet spot cleaner in your home right now. Windex!
Spray the spot on your carpet with Windex (if you have white carpet, be sure to test an inconspicuous spot first). Using a white or light-colored towel, gently rub the spot. Let sit for about 5 minutes.
Now, fold the towel a couple of times, put back on top of the spot and tap (or stand on) the cloth with your foot. Remove the cloth and admire your spot-clean carpet!
FYI, the spot may come back in time but it’s great while it lasts.