Be advised that most limousine services clean their glassware the same way as is done in the hotels..while guests (clients) are partying etc.the limo drivers take the dirty and used glassware for drinks and clean them with a window cleaner usually Windex, wipe them with a towel, and replace them in the passenger compartment to be reused later in the evening..I know as I was a limo driver in the past...this practice is used by many...