This is vital for flight simming! I don't know how many times I thought I'd seen something off in the distance, only to discover it was just a dirty screen!

Cool!  So, my monitor isn't too bad.  But still pretty bad.

This is vital for flight simming! I don't know how many times I thought I'd seen something off in the distance, only to discover it was just a dirty screen!

 

+1

Best not to clean your screen at all with it powered on, though; kind of like trying to clean automobile windows in direct sunlight.  Heat makes things evaporate too fast and leave residues.  Before you've turned on your screen at all (not a warm one you've just turned off), start with a mild commercial screen cleaner.  Use a wet towel and a separate dry one.  After that's dried, repeat the process using plain water as a finish; same process, one wet, and one dry.

 

It should end up looking perfect  

 

Then you could go to the "whitedisplay.com" site to check it every which-way, after you're done