Non-porous materials — silicone, glass and ABS — are the easiest to keep clean: warm water and a mild, unscented soap (or a dedicated toy cleaner) after every use is all you need.
Let toys air-dry fully before storing them, ideally in a breathable pouch rather than sealed plastic, and keep silicone toys away from silicone lube to avoid surface damage.
Batteries out before storage, cords coiled loosely — small habits that add years to a toy’s life.