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I would consider a few things essential to owning a pair of quality suede shoes. A good suede brush, a suede eraser, a waterproofing spray, and this. This cleaner can bring back old suede from the brink. Highly recommended!
A very strong cleaner for my beige military styled suede boots. It effectively removed residual black shoe polish that accidentally got on the suede via a brush which is I used for buffing wax polish off leather shoes.
You only need 1 parts ON Suede Multicleaner to 2 parts water (Translation: 2 capfuls of ONSM and 4 capfuls of water). That was enough for the left and right boot and even then I thought it took a way a bit of the boot's original colour.
I easily fixed that with Saphir Suede Nubuck Renovateur afterwards. Perhaps Bootblack can look at stocking that.