This topic seems to be coming up frequently with all of the new Nabuck Watersnake out right now.
I am offering what I've been using for several years to water/stainproof all of my Nabuck, Opaco, python, watersnake, eel, suede, alligator, lambskin, etc shoes (Louboutins) and handbags (Chanels).
I am not making any guarantees or promises but everyone that I have given this advice to has had great success with it.
The product that I use (which is what the best cobblers who deal with exotics use) is Meltonian Waterproof/Stainproof. A link to it on
Amazon.com is here:
http://www.amazon.com/WATERPROOFERS-AND-CLEANERS-MELTONIAN-WATERPROOF/dp/B004IA0RI8
Spray your shoes, bags, etc, one time from arm's length away completely. Let dry overnight. Repeat. When you first spray them, they are going to darken. You will see them immediately start to lighten back up to their original color as the spray dries. Don't panic.
They will get dirty. Buy a very soft brush (I use a facial brush) to brush the dirt out of the scales. Go against the scales. Never retreat a dirty shoe or treat a dirty shoe as you will simply be embedding the dirt into the scales that way.
I treat my shoes, depending on wear, every 6-8 months and have them professionally cleaned as little as possible and only as needed. When you have them professionally cleaned, make sure you tell your cobbler that they are treated with Meltonian because they won't have to use as harsh of a cleaner.
I have used this on start white Opaco python and just got done spraying my new Powder Pink Jennys.
To show you how good it is, my original Powder Pink ADs are 3 years old and I am just now going to dye them, not because they are so dirty but because I now have (finally) new PP shoes and can dye these. They have been professionally cleaned 4 or 5 times.
The more you have to professionally clean Nabuck or Opaco, the more the python lays down. So, that's why it's so important to treat your shoes as soon as you get them.
Feel free to ask any questions. But, hopfully, this gives you the information that you've been looking for.