https://www.arcticsilver.com/arcticlean.htmNot sure where in the world you are but there are a few 3rd party people I see selling it on Amazon US and there are also a few other places online too.
I did find heat does help a little too when you are using other solvents, BUT things like 99% isopropyl alcohol and acetone are VERY VERY VERY flammable so you might get the paste off or you might set yourself on fire or both. So a more specialized cleaner is probably better.
-Dave