In general, no. It can, but it will leave you with a slick, sort of oily finish, which won't really look like suede anymore. For suede, the only thing you can do is use the modern sort of waterproofing sprays: there's various compositions, some of which might devolve the dyes in brightly coloured suede, so you should probably go to your local shoe repair shop and ask what's right for you.
Salt is water soluble; just wash. After washing the salt off, let the shoes dry and apply saddle soap, mink oil or neet's foot oil to restore the moisture to the leather and keep it from cracking. For light-colored leather and suede, saddle soap will be less likely to discolor or stain like oils will. Test a small area first.
Go to shoe store and buy Mink oil. That's how I used to do all my shoes.
If they are black suede and it has turned grey and flat. Try this:First, brush the suede with a suede brush to make sure it's clean.Dip a soft toothbrush in baby oil and let excess oil drip off or touch the brush briefly to a towel to remove excess oil.Then, brush all the suede gently.Allow the oil to soak in for a few minutes.Rewet the toothbrush with baby oil and repeat until the suede looks uniformly black.Allow to dry overnight.This only works with black suede.
a lot of mink oil or boot oil
Of Course! it is definitely the best thing for white leather, especially white leather golf shoes! I use it very often and find it cleans and replenishes the leather extremely well.
it's something for squeaky minks
Apply saddle soap or similar conditioner to the jacket and let it dry overnight, then take mink oil and apply that over the jacket, this should restore the suppleness to the leather, aswell as restore some color to the jacket.
they look and feel good
You could try a suede brush on them.
Most shoe polishes are wax based products so, therefore, you wouldn't need the mink oil because wax is a natural water-proofer. It's hard to advise on this issue since I don't know what material you are working with. I would call your local shoe store and tell him what you're working with. Chances are that he will have just the solution for you.
Get mink oil and use it regularly.
Oil Them.........