I tried the put some padding under the back of the bonnet to lift it slightly as the fan had turned on while driving the first bit. The further south we went the temp dropped a bit so it was OK from then on. It never when over 90.
Bonnet stayed clean
There were two kids on a bridge who thought it would be funny to try and spit into an open top car. I put my foot down and missed it. Shame you can't stop on the motorway and shout at the little buggers.