Wolfgang leather cleaner/leather conditioner combo gives me nice results (a like new clean crisp look).
I first apply the cleaner with a microfiber applicator, I spray the leather cleaner onto the applicator and do a section/seat at a time. Since your car is new, your leather should be clean but in general dont rub into the leather with too much pressure supposedly this pushes the dirt in deeper. I pat/scrub lightly and sometimes wipe off any excess cleaner with a microfiber towel. Once I've cleaned all the leather in the interior, I move on to the conditioner and using the same method to apply the conditioner. Make sure to use a seperate clean microfiber applicator for the conditioner. And after letting the conditioner dwell for a few minutes take another clean microfiber and wipe down the leather once again.
Goodluck with that '09 TL!