White salt film on carpet

[Hoss]

I assume that what you are trying to remove is calcium chloride. White vinegar will dissolve calcium. So, you could try a white vinegar solution, let it dwell, blot or padcap and then extract again. BTW ~ keep vinegar and CLR away from marble! One of my customers had tried to remove Mop and Glo from their marble floors with vinegar and totally trashed the finish. While you are at it keep customers away from Mop and Glo!