1) what might it cost
I would need a postcode and more details of the vehicle, preferably pics as well mate, can whatsapp them to me at 07811430278 or email info@ddblasting.co.uk
2) would it make a mess
no messier than using a pressure washer. 99% of debris drops to the ground along with the media we use.
3) I assume it must be done outside
better off outside yes, everything around the target gets wet
4)how do you stop it ruining the paint at the edges...like the sills?
our system is very precise, we can blast to within one cm of anything without causing any damage