Timberland "Balm Proofer™" All Purpose Protector. Protects Leather, Suede, Nubuck & Fabric against water and stains for Footware & Apparel : Amazon.co.uk
Timberland Shoe Care Boot Sauce Shoe and Boot Cleaner - Neutral
Product Care - Timberland - Singapore
Timberland Fit, Care And Size Guide | Buyers Guide - AllSole
Cleaning & Protecting Timberland Boots | Official Guide | Timberland UK
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 | Timberland Boot Kit | Cleaner | House of Fraser