Well, the protection strategy for my valuables is not "leave the car locked in the shop". And then there's that one customer who's "rattle" is something in the

Well, the protection strategy for my valuables is not "leave the car locked in the shop". And then there's that one customer who's "rattle" is something in the glove compartment, to extend the metaphor further. So, in keeping with my points above, I would probably move the really valuable stuff out, but for some customers taking everything out will prevent the technician from removing the issue (and they will probably be blamed for it) and if I feel the need to completely get everything saved out of the car beforehand, I would not trust that shop with my car, either.