Test it first, some chemical cleaners can be too strong and ‘melt’ plastic. (Not melt but will etch it or make it sticky). However cleaning agents can only ever remove the surface smells. Depending on the type of plastic (ie the ingredients the plastic is made of) it may smell for a shorter/longer time as the smells slowly dissipate. Some plastics can smell years later, some are fairly inert smelling after a few days.