It is used like shampoo. You wet the shoe and using a wet sponge or a piece of hair-on sheepskin gently work up a lather. Rinse, let dry and apply a light conditioner of brown-bottle lexol.
Using the sponge or the sheepskin and gentle action I don't believe it is possible to remove finish with Lexol-ph. It is the "sudsing" action--foam--that lifts the dirt, not elbow grease.
Parenthetically a ph neutral baby shampoo such as "No More Tears" is just about the same thing.