If you keep the genie as a sim to play with, no need to upgrade anything to self cleaning. When a genie uses the "clean the house" action, everything gets spotless, including the toilet, the shower and the empty plates

.
Actually the great thing with genies is that you don't need a stove, a shower, a dish washer, well you can do with just a toilet and a bed. (You can even forget the toilet if you dare to

.)
But if you don't want to keep the genie, this is a smart way to use it Grimsoul!