I completely feel your pain being in Chicago this whole winter! Water is key here to break down the salt stains so using it with vinegar, steam cleaner, or simply spraying alone then agitating will help. You may need some patience as it may take a few rounds of going over it, but it should yield good results. Make sure to dry everything well as you don't want to create mold and horrible smells later on.
Let us know how it goes.
Ivan @ DI
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