Thanks for all the preaty messages...
Well.. About the exhaust stains... Well.. It will get dirty.. But far from ruining the paint i don't think so.. It had never happened before to me... I wax it very often and clean it after every flight or two.... Well some times maybe 3, but i do clean it very often....
And it was an old ship... But the previous owner took such a great care of it, that it wasn't difficult to keep it shiny... All its components are in excelent shape and the avionics are also great. Will send a picture of the panel soon
Thanks for the compliments.