[Hot Tabasco]

I wonder if they use Windex to clean the mirrors.......

[The Truth Will Make You Free]

https://www.space.com/37730-how-to-clean-very-large-telescope-mirror-video.html

https://scopetheuniverse.com/how-to-clean-telescope-mirror/

[HartleyMBaldwin]

Just breathe on them, a quick wipe with a bandana, and they’re good to go. Windex and paper towels only needed for dried-on stuff.