There are no acids. Potassium Chlorate is in the primer rather than Lead Styphnate. The Potassium salts attract water which will rust the barrel/action in time.
All you need to do is run water through the barrel and action if it is an AK, or just down the barrel if it is a 91/30. Wipe it down, spray something like Rem Oil over it and clean it when you get home. The Potassium salts are water soluble and will rinse out.
Windex in unnecessary, as Rem222 said, you won't get a rusty barrel if you simply clean it when you get home rather than do the rinse job at the range.