Carpet help

[liebschien.livejournal.com]

A year or so ago I spilled Mod Podge on my carpet. I tried to clean it up when it happened, but I didn't do a very good job. It hardened and collected all the gray dirt in the room.

So...I've been living with this hardened gray splotch for so long that I became very used to it and kind of forgot it was there - until I was informed a few days ago we will be moving and the house is now up for sale and a realtor is coming to take pictures on Monday and What Am I Going To Do About The Mod Podge Splodge?

If anyone has any ideas, no matter how insane or outlandish, on how to remove year-old hardened mod podge from a carpet I am willing to try anything. ANYTHING. Except replacing the carpet.

Thank you!