Yes! Several mechanics have told me it makes a difference in the service they provide. Appliance repairers say the same thing. 

In my home improvement business I'm sure I'm more meticulous in a super clean house vs a pig sty.

I'm also careful to wash or rinse my bottles and cans before returning them for the deposit. The attendant will sometimes add to my count.

Sent from my iPhone

> On Nov 3, 2017, at 2:07 PM, Dan N <dn92610@GMAIL.COM> wrote:
> 
> do you think the cleanliness of your van (ie. engine bay, interior,
> exterior) has any influence on the mechanic's work...
> 
> would he pay more attention, being more careful (or less) if your van is
> clean or dirty?
> 
> dan