I also do everything by hand. It's just personal preference for me, mostly because I'm not looking for labor-saving tools... detailing is my excersize program!
Anyway. I've had excellent luck with 3M Swirl Mark Remover topped with Zaino.
Now, keep in mind that there will be people here who say, "No, you're only putting a band-aid on the problem"...
But my experience has been that the light scratches and swirls don't come back.
I usually apply this product two or 3 times a year followed by Z2 with Z6 touch-ups.
Here's your "Black Glass"...
