I normally get the trail of muddy footprints up the centre of the bonnet, followed by the pile of fur on the roof where he's slept off his epic climb up the bonnet, then he exits via the bootlid leaving more prints
options are limited as he belongs to us
that is so trueAs a cat owner myself I can offer you an elegantly simple solution ....... cats will ALWAYS select the optimum seating position in any given environment .....
Put an open cardboard box near your car ( preferably where it gets maximum sunlight ) and I'll guarantee the cat will choose to sit there above anywhere else.
here's our cat Simba in a cat trap, he weighs well over a stone and sat in the smallest possible box