Black residue on back of motherboard

[ma21212]

I replaced my motherboard and found that there is this dark residue on the back. What is it?

https://i.imgur.com/B2186jl.jpg

[WhatTheHell]

Mountain Dew? Hash oil? Engine grease?

 

You've given absolutely no information such as are you using watercooling of any kind etc? I'd recommend cleaning it up with some electronic cleaner, fix it back in, ensure said stuff will not appear again/check case materials and forget about it. 

[ma21212]

Fair enough, I made a post a week ago and did tons of trouble shooting.

 

https://linustechtips.com/main/topic/907100-pc-restarts-mid-game-monitor-shuts-down-tried-to-fix-this-for-2-days/?tab=comments#comment-11151333

 

There is no water cooling. Its all standard cooling. Does this seem to be a damage mark? Ive never had a damaged/burnt motherboard so Im only looking for a second, third opinion.