The Laundromat at the Edge of the Universe by A. P. Hubbard

When a meteorite blasts thirteen-year-old Jasper Snerts house into a million smithereens, his parents tell him its time to get a job. They didnt have meteorite insurance. They need money for a new house. The only job Jasper can find is cleaning up around the old laundromat out on Highway 51. The laundromat is a strange, lonely place. When the weird, old washing machine repairman explains that hes actually the immortal sorcerer Ozmodis, who helped the Pharaohs build the Pyramids, it gets even stranger—especially when it turns out to be true. . . .