My VW 8 years liao, so doing it outside.. not with official center
Last time when I got it new and under warranty, I sent to Wearnes SG Besi (they close down Liao, GVE took over), Wing Hin Balakong, FA Glenmarie and GB Klang.. because I pindah rumah, so I have visited a number of SC..

Best is Wearnes, always give courtesy call when I placed my car their for few days.. too bad they decided to pullout from Msia..
GB klang quite transparent services advisor.. worst is FA Wagen.. no update no follow up when I put my car there to claim warranty..

VW SC (depending which one) last time offer free wash exclude engine bay. Engine bay wash cost rm50.. long time didn't go back VW SC.. not sure what are they offering now.

Honda Tiong Nam do charge for washing (in and out)

The key is to know how to differentiate compulsory service and optional, and owner really have to know are those optionals necessary and are they priced reasonably..