Best results I've gotten from a suede eraser on the boots I've tested: removes dirt and polish marks from fine, white suede effectively. The eraser's texture minimises worries I had about worsening more severe scuffs too, very gentle compared to more rubbery-feeling erasers.
Works a treat - Meermin Suede boots looking good as new.
Gommadin Suede Eraser
Used this on the water marks on my suede, and it instantly disappears. Very satisfied!