Five years ago I made one of the best purchases of my life. I had a bootmaker named Jim Freeman in Middlebury Vermont make me a pair of custom hiking boots. I've probably logged 3,000 miles on those boots since then, and they have been wonderful.
When Freeman gave me the boots, he told me to use Lexol leather shampoo to clean them and Sno*Seal to seal them from water. Unfortunately, I have found that after five years, these boots have started to show some significant cracking around the flex points.
I decided that it was time to start looking for some replacements to use when these boots got too cracked, and I came across the Limmer family in Intervale NH. I got a new set of boots (factory made in Austria) from them along with what they recommended for taking care of the boots: Limmer Boot Grease.
During the process of breaking in my new Limmer boots, I've been using the grease on the new boots, but I've also been using it on my old Freemans, and it's definitely rejuvenated them. The leather is more supple, and more waterproof.
Something simple that I like: a hand-made product that lets me keep something that I treasure in good condition.