strange round spots on 3930K CPU after cleaning with Arcticlean 1

[lukx]

After I cleaned my CPU with arcticlean nr1 (http://www.arcticsilver.com/arcticlean.htm)
I noticed strange round spots in those places:

. They disappear when it's getting dry. Is it coming form fabrication process?

 

[Eureka!]

Sounds like the moisture from the cleaner pooling on uneven surfaces. The IHS of your CPU isn't perfectly flat.

 

[mothman]

I've noticed that to on every Intel CPU I clean with the two step Arcticlean. It goes away after using the #2 part. I bet Intel uses an automated suction cup device to place or move the CPu's around and what we see is the residue left behind by 4 small suction cups.