I favour pale beige trousers and the other day, after a run in the Morgan, I found black greasy marks behind the knee. I thought I must have brushed against something, certainly not my lovely clean car. Following day the same thing happened.

not impressed with having to clean two pairs of otherwise freshly cleaned and ironed trousers.
I started to get suspicious and remembered the door swinging onto the back of my leg and snapping the door catch closed while I was putting the hood down. Back to the garage with a clean white cloth and I wiped it all around the door catches. Sure enough smears of black grease. With the days getting quite hot there is probably a little surplus grease starting to come out of the lock assembly.
Remedy

: 1. clean the lock catch before a run (for the moment anyway) 2. Fit stainless door straps to hold the doors open.
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Peter
Plus 4, Sport White (Ivory) Mulberry trim