You could also try Meguiar's "trim detailer" (gold class) --at $7.99 it works very well and holds up for about six months. Also, I would suggest an "applicator" or sponge-less streaking and reusable.
Ding-Ding-Ding...GOOD ANSWER...
After trying Meguires "grape jelly", I'll never use another product.
Goes on easy, & lasts for months, not weeks.
...OK, I guess three months IS equal to twelve weeks...