Electro-Wash is a procedure that can clean objects without the use of water.
Simon Lynch posed as a window washer in order to waylay Ramon Medina and used an aerosol spray on his car window.[1]
MX-43's clean themselves in shower cubicles using a non-water method, presumably an Electro-Wash.[2]
Electro-Wash is an actual product produced by Chemtronics.
"Electro-Wash® PX is a fast drying, one step precision cleaning and degreasing agent safe for most plastics. Engineered with very low surface tension, this high pressure aerosol formulation flushes areas clean and evaporates instantly leaving no residue."[3]