
Help needed
Found this stuff on a CRT, what is it and how do I clean it?

Found this stuff on a CRT, what is it and how do I clean it?
I have a PC with a F2A85X-UP4 motherboard, and wish to upgrade the graphics card, such that it is capable of sustaining gameplay of Dead By Daylight, the Poker Night remake, and Evil Genius 2.
Advice is appreciated, and I thank all contributors in advance.
I'm currently DMing spelljammer, and wish to add rayguns (as seen in Dr. Grordbort's Scientific Adventure Violence, not the horribly done DMG ones.) What I need is advice on how to write the merchant that sells these rayguns. Thank you in advance!
Why do we have a Modern Aperture flair and a 70s Aperture flair but not an Innovators and Fixtures flair?
Who was in charge of the company between the death of Cave Johnson and the creation of GLaDOS?