Never seen that before. How old is the carpet? I'd have thought steam would be ok as I believe (from what Sian said) the person who cleaned our carpet recently used a big steam machine.
It is brand new, which is why I don't want to damage it.
Where did you get the acetone?
If only!
Kos: From work. You can get Acetone on eBay though if you want.
Pretty quick this Internet connection!