All depends on how large an area you wish to remove the coating from, if the part can be removed from the car and what you plan to do to the surface after the soft touch removal. Many of the plastics are the same colour plastic under neath but others like switches are white plastic as you probably already know.
As for cleaners, warm soapy water, hand gel, IPA or acetone in rising levels of strength and a tooth brush, nail brush or plastic scourer. Always use the minimun chemical especially the more powerful ones. Can get messy quickly so protect yourself and the area you are cleaning in. I try to get the part into either a plastic container or a bin bag and clean outside.