How to remove "Great Stuff" from a window??

I installed new windows a few days ago. When i sprayed the foam in the cracks it expanded and came out and onto the actual window itself.

See bottom left hand corner of pic...not a good pic, but you'll see what i'm talking about.
https://flic.kr/p/oghWqs

I used a razor blade to cut the big stuff off like normal, but all that yellow crap is on my window now...
Is there an easy way to get this stuff off? Sandpaper is looking like the only way. I've tried almost everything.

 

It most situations I've used great stuff I can clean up with unleaded gasoline, but this might be a situation where that wouldn't be so helpful. In theory you could used a soaked rag and wipe up. Just my 2 cents, be careful of drips on carpet and wood trim. Also the smell of gasoline can be unpleasant to some people if spilled.

 

Its on the vinyl. Not on the glass.

 

goof off although it's not near as good as it used to be. Pure Acetone, wd-40

 

Razor blade worked perfectly. Tried a plastic one and it did OK...Then i was real careful with a brand new metal one and it worked a lot better.

Thanks for the advice