

Cleaning Advice
Tried rubbing alcohol. Didn’t do anything.
Does not appear to be dust.
Curious if it is rust?
This is the side opposite the stock fan.
In the middle of deciding how to mod this one still. Can this be cleaned?
Thanks all!
Update : metal piece under the power supply(?) stamped with h1-1 has rust spot about the size and thickness of a dime.
Another user mentioned using a dremel to remove rust and also using Rustoleum to stop the spread.
Does this still apply? Will fine steel wool remove enough of this to stop the spread?
Any advice very appreciated.