I've seen you have had a few comments on this. I'm curious to see what you come up with? I've got 2 pairs of whiskey shells with spots. One is similar to yours, the other rains spots from yesterday. What really pisses me off is I put leather defender on them yesterday am before I wore them! Still got rain spots.
Thanks for replies! The short summary would be; nothing particular, keep wearing and brushing and contact a renowned cobbler if there is a real problem.