Turtle Wax Black Box is basically a paint filler/glaze made specifically for black cars. When you wash the car again the fillers are removed and your back to swirl marks again. Hopefully your polish work with the Meguiar's removed the majority of the paint defects so this isn't the case.
I have owned black cars my whole life and have tried a ton of products thru the years. Whats in my cabinets has been alot of trial & error (& cash....
). I have used a direct drive Makita buffer for years when it was the industry standard along with a 10" orbital for paint correction. I researched and finally splurged to try out the Griot's Garage 6" random orbital (I then of course
had to buy the 3" also....
). There is absolutely no comparison, the 6" & 3" orbitals are world class detailing machines. I won't use anything else. It cut out the swirls from direct drive buffing and I can probably throw out the majority of my compounds & polishes now.
I had a door paint chip from an idiot in a parking lot this spring (thanks!) and to fix it I had to respray the entire door and passenger fender. The painter tried to blend in the clear coat on the hood and drivers side fender with a direct drive buffer and harsh compounds and then used a filler to cover it up. I washed the car this weekend and the hood looked like cattle stampeded across it. I used GG Machine Polish 3 along with Meguiar's Gold Class carnauba wax with both the 6" & 3" orbitals and the final result I couldn't believe; the depth and clarity is astounding. ALL swirl marks & defects are gone.
The picture below shows a sample of a direct drive swirl mark that I had all over the hood & driver fender.
Finished (now that's a nice reflection...):
My product cabinet (notice Black Box on left side...):
Random Orbital's (Makita & 10" orbital are in the basement..):
You also stated you Armor-All leather cleaner didn't work to your satisfaction. I agree. I have always had leather in all of my cars and the best products I have used have been Zaino-Leather in a bottle (although it leaves a white residue in the grain when dried....) & Leatherique leather products. I used Griot's Garage Leather Rejuvenator for a first time on the 928 (I re-covered both the center console box and the rear storage box lids in leather) and again was very pleased with the results. it actually worked better than the previous two products I listed so this is now going to be a staple in the cabinet. I cannabalized the leather from the backs of two old seats I have in the basement so the color would be spot on. Both of these turned out extremely well and clean up the interior nicely (the old leather I tried to save but it was just too far gone and was becoming an eyesore). See for yourself. The GG Leather Rejuvenator made the leather buttery soft & the interior smells great.
Center console box original (during repair incl. re-dye):
Center console box new cover:
Rear storage box ( I used Leatherique products to "keep it alive" incl. a re-dye job but it was too far gone IMO):
Rear storage box finished(corner seam detail):
This not a post for Griot's Garage products per say but their products work as described and they compliment each other well which in my mind is a huge time saver. I have yet to try their waxes. I like Meguiar's Gold Coast carnauba; it's ez to work with, leaves a tough finish and it smells great.
Sorry for the post length fella's.