If you are just about to put your car up for sale or if it's being handed back to the lease company or being traded in etc, the Pre-sale Detail is not only going to ensure that the car receives tonnes of interest due to how amazing its looking but you should also find that the value will increase proportionately on the private market.
You don't have to go crazy with preparing the vehicle for sale in terms of having it fully detailed so the options below are what I'd recommend before putting a vehicle on the private market. At the very least you will be able to put the cost of the valet if not considerably more onto the sale price but with lease or PCP returns, its usually a case of getting the vehicle back up to presentable standard.
A versatile service to meet your requirements however listed below is what I would realistically recommend before putting your vehicle up for sale on the private market