@JSO1 those look nice and juicy! Do you then apply something else to bring the shine back? Or does it come back naturally? Or do you prefer a more matt look? I think I'm gonna get some for my brown Kenilworths. I've got this happening on one side
I wipe down with a damp cloth, brush, apply a blob of Bick 4 to each shoe with a cloth, rub the Bick 4 into the shoe with that cloth, let the shoes soak up the Bick 4, then I give it a little brush once more, and then I buff them vigorously until they shine again.
The shell is quite non-porous but seems to happily take in the Bick 4. It doesn't clean so much as condition, so if you're trying to get the factory gunk off the shoes you should use another product. Personally I decided not to get the factory finish off on either pair of shell I own, so I just use the Mac method most of the time, and hit them with Bick 4 when they need it (if they've got rain welts or have some dry patches coming up).