RE: cleaning the laptop.
For over a decade now, I've cleaned laptops only one way, and I've never had a single issue with the display having issues or anything else.
With it shut completely down (I need to figure this out on my 2018 MacBook Pro), I use a Mr. Clean Magic Eraser, slightly damp over the top and bottom of the laptop. That removes any smudges, or anything else easily enough. You don't need to scrub with so much force you end up taking off the anodization, just rub it gently enough to clean. I then dry it off with a microfiber cloth.
I'll open the laptop, then clean the palm rest area with the same Magic Eraser, and then dry.
Taking a second microfiber, I'll dampen a corner of the cloth with rubbing alcohol. I've used the 70% stuff as easily as the 91% stuff. Whatever you have at home probably is fine....and I'll wipe down the keyboard and trackpad with this. I don't use so much alcohol to saturate the rag, just enough to be able to wipe off the keys and trackpad to remove the greasy film that develops from use. Plus, the alcohol evaporates rapidly, so there's no need to dry this.
For the display, I'll lay the laptop on the back of the display so it's facing upward, then spray it with eyeglass cleaner. I've used so many different brands over the years, but for posting sake, I have the Walgreen's variety here now. I just spritz this over the display (and I've done this to both MacBook Pro glass displays, and the plastic MacBook Air displays) and wipe that clean with a third microfiber cloth.
That's it. We've had 40 some odd MacBooks, Airs and Pros in our extended family, and every single one has been cleaned either by myself or one of my siblings in this manner with nary an issue.