You could try spraying them with suede cleaner, then when dry rubbing very gently with a suede brush.

Water stained suede. Water staines on suede [deleted user] posts: Blot away as much moisture as possible with a clean, soft cloth. Be gentle with the suede brush

Saphir suede shampoo starting more dilute and completely washing all suede panels. Before applying any sprays or polishes to your suede, it’s a good idea to remove all dirt and grit. Removing liquid stains from suede.

Wipe off residue solution from your shoes. Technically speaking, suede is waterproof in the sense that exposure to water and other fluids won’t ruin the material outright. However, you write that you have.

Mix 2 cups of water with 1 cup of white vinegar. This should even out the color of the suede. Cover the stain affected spot of your shoe with this cleaning solution and let it dry.

Then, pour rubbing alcohol on a cotton ball and gently blot the stain. If the dreaded happens and you get suede wet, allow the suede piece to dry completely. Dirt is one thing but most would consider water stains.

Basically, follow the section “how to remove water stains from suede shoes in 4 easy steps” in the post above. It my get some of the white tide. Did you ever think you could recover those water stained shoes you wore to a club, on a rainy night, or on the beach?