Thanks - Me too. My 2yo went through a phase where he'd just draw on ANYTHING if he could get his hands on a pen/marker/crayon. Drove me crazy! Lol. I thought id gotten all of those out of reach and then he went into his sister's room and into a drawer and happened to find a single black marking pen and just went to every piece of wooden furniture in her room and marked on it. Just a few big circles/scribbles on each one. Then across the wall and the carpet. That's what I get for taking a shower w/an 20month old, right? Lol. ;)
Also mr clean magic eraser works pretty good. Ive gotten dry erase marker out of clothes before with rubbing alcohol. I bet it would work the same with carpet. Just keep blotting it with a white towel. You may be able to scrub with a toothbrush. But I would be afraid that may push it further in.