Update to my last post: the Timberland Boot Kit helped a bit, with a few cycles of brushing and cleaner and then conditioner. But what ultimately helped most was dried bread. :
Timberland Boot Cleaning Tutorial - YouTube
TIMBERLAND | Boot Kit
Timberland Product Care | shoe, leather, boot, friendship, tutorial | #DidYouKnow our Boot Sauce Conditioner is a big hit for caring for your leather bodied Timberland shoes? SHARE this tutorial with your
How To Clean Timberland Nubuck and Leather Boots at Home
5 Tips on How to Clean Timberland Boots | Boot World