New here!

Welcome!

How about a small addition or two to the good list?
Before power washing under the hood, at least cover the alternator with plastic. Have WD-40 and paper towels if the plug boots leak and ground out when you try to start it. It stinks to get stuck at the car wash after power washing everything.

Looking at the engine bay pic, I see the cable ends have been replaced with the clamp on ones. To maintain good connectivity, corrosion must be avoided. I would take them off, clean the posts, the wire ends, and all parts of the clamps. Then spray all the metal parts with battery anti corrosion spray (red stuff). A small can will be enough to keep batteries on multiple cars for years or until you loose the can.
New cables are preferred, but If the other end is good, this will keep the electrons flowing for a long time.

I got stuck at a car wash after washing the MIL’s K car. It needed new wires, plugs, a cap and rotor anyway. Water in the plug boots and distributor was the only thing that could kill that car.
I’m too cheap to buy a power washer. I bet I have spent plenty of quarters at car washes to have bought a small power washer years ago.