That´s terrible service... and gives a terrible image on the seller. Every time I have sold one of my cars to a new owner, the cars receive the royal treatment in terms of cleaning up, waxing them, etc. Its my "goodbye" present to the cars, and to the new owners its a great satisfaction to have a shinny "new" car.
When I bought my 2010 GT (used from a Toyota dealer) the opposite actually happened, they really tried to exceed their great service and decided to apply armor all to ALL the interior surfaces... It took me a week of wiping the oily stuff off the car LOL...
2015 50 Anniversary Package GT
2014 Race Red Premium GT Convertible
2003 Silver GT
1981 Ford Mustang Fastback
1966 Mustang Coupe 289 4V
15 years ago 1984 Ford Mustang Hardtop