If the problem is mildew, you must first find where it's coming from and kill it at it source. Lsyol is one way, but I would ask the dealer about it and they may have a better killer on the mold, mildew problem... I have infiniti G35 and I have the same problem. Had to remove air filter on the inside and clean out the coils and heating unit, because that's where the mold for the mildew was growing. After that, no more problem. That was about two years ago.
Know, if it BO, place take a shower(smash)
Good Luck.