Nothing like an engaging demonstration of prowess to sell something in a non-sales way. Basically, a guy cleans up a Lamborghini; the attention to detail and explication give the impression that guy knows his job, runs an honest shop, and does right by his customers. To top it off, he displays his work in a public forum of fellow enthusiasts and receives accolades.
Note that he didn't choose to document the cleaning of a Fiat Multipla. ;)