Open thread: What’s the best stuff for black suede to protect against water and stains?

I’m going to try out posting little “open threads” on various helpful topics, we’ll see how it goes: As winter approaches it might be time to protect your shoes – What’s the best spray, substance, product and/or DIY solution for black suede to protect against water and stains? I’m sure many folks have sprays, products and homebrew solutions they’ve had success with – post them up in the comments!