Urghhhhhh you can do damage with plain old water if you apply too much. A very slightly damp cotton pad could help remove grime and dirt (and top layer of polish).
I watched the gf's brother apply a wet rag to a pair of "high quality" Italian black shoes and wonder why they went matt and soggy.
I've got the stuff already 🙊
Will report back.
When I bought them Loake recommended cotton pads and water. What's that about? Always been about the two brush approach.