Sweet Tea Deputy!
Genies are mystical beings, and not the easiest to discover. Late night trips into the catacombs, journeys through the dimensional gate on the Plasma Punch Gyroscopic Conductor, and even a legendary stage performance are all ways you could find a dusty old lamp. Of course, if you want to go the tried and true route, saving up lifetime happiness points to buy a lamp is always a good way to go. And, once you find one of these mysterious dusty old lamps, what else would you do but clean it!