Originally Posted by DWFII
A quick comment...I've never used Saphir Renovateur but rubbing something on, even if you wipe off the excess isn't going to clean anything--it just moves the dirt around.
Dirt...the kind of dirt that gets on shoes...is, by nature, gritty. It is often comprised of microfine particles of ground rock, old coke bottles (there's a straight line for someone) and even, in some regions, obsidian glass.
Unless the shoe is washed on occasion...like when the moon is in the seventh house...and rinsed, those particles lodge in the creases of the shoe and act like any other abrasive--cutting the fibers of the shoe.
Don't confuse cleaning with conditioning.
If I might be so presumptious as to illustrate what DWF is saying with an analogy that many here on teh StyleForvm will understand:
It is like the difference between Americans and Canadians on one hand, and Europeans on the other.
Americans and Canadians (and by "Canadian" I, of course, exclude French Canadians) tend to shower and bathe every day. This habit helps to remove microfine particles of ground rock, old coke bottles, etc.
Europeans, in contrast, do not. They tend to rub lotion on their bodies and to douse themselves with cologne instead of bathing. This just moves the dirt around...including obsidian glass that settles on the body from the periodic eruptions of Vesuvius (a cone-shaped mountain near Naples.)
I hope that was helpful.