Anything with ammonia is bad for window tint. It is also bad for touchscreens, monitors, tvs...windex product WILL rape any window tinting you have i was told
i used to wash the inside of my windows smudges at the gas station by whetting a paper towel from the squeegee bucket on site... bad idea!!!
Used to use a product called Bumper Back. It was awesome, but looked for it now and it is no longer available. I found it when I was restoring a TR7 around '91 and it took the sun faded rubber bumpers from medium gray to black. A yearly application kept them looking new. Main thing to look for, though, is something that is not silicone based and adds moisture. Generally it needs about 24 hours before getting out into the elements.looking at exterior black trim gen1 and gen2
both plastic AND the rubbery items
.... have tried SO many things for long-lasting results
Sounds like you were using something that was a silicone-based dye. If those were a baseball team, they would be undefeated with all the runs they have. Probably could have gotten a better result from just armor all.
Just doing some browsing... Found Forever Black. Looks like it might work. It isn't silicone based, so it shouldn't run, but it would probably last half a year. I would try this, then after it has dried, cerakote it. That should keep it looking great for quite a while.