I use a leather wipe! Works great
Kiwi has lots of great products. But, if your boots are of nice quality, you can just rub some leather balm on them. I like the stuff by passier.
i swear on the curium soap by VEREDUS and their boot grease, Curium Baldam, with avocado oil. they're amazing and affordable.
The brand kiwi has pretty good products and selection