Tires I apply with a foam tire pad
Trim- it depends on how big the trim is but I will either use the foam applicator it came with or one of those foam paint sticks and paint it on. Then a few minutes later I buff it with a microfiber. You may need to do a second coat. If that doesn't work I believe there are a few other products that will darken it, but I don't think they last that long.
Last option is to replace or repaint.