This is probably the best product to clean up CPUs, GPUs and any gummy heatsinks that need their old thermal paste cleaned up. Isopropyl alchool works great, but this 2 bottles kit has 1 to REALLY clean up the gunk fast and the second bottle to clear up any residue and keep the surface as pristine as possible for your next thermal paste application. I had an issue with this order, and only received bottle #2 from the kit. I contacted Coolerguys and they promptly sent me a free replacement of bottle #1 and bottle #2 (did not even need to send back my bottle so now I have an extra #2 as a bonus). Great customer service guys, really appreciate it!