I just use Dawn or Ivory dishwashing soap on plastics. Put them in the sink with some warm water and dishwashing soap and gently wipe them with a soft cloth front and back, rinse and pat dry. They have always come out looking very nice. You don’t have to scrub hard at all. I even use the same method on all the circuit boards to give them a first cleaning before working on them but for those I scrub pretty good with an old tooth brush, and of course then give them an alcohol bath to displace all the water.