White Residue On Flooring Under Carpets

First time wanting to rip up some carpets and did a test in a closet corner. Has anyone experienced white residue under the carpet pad? It took some s

strange white substance on carpet in back seat

How to Remove Rug Pad Marks From Your Floors (Updated)

What's the white powder under my rug??

White powder coming through floors

Best Carpet Padding for Your Floors - The Home Depot

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A Complete Guide to White Oak Flooring

How to Remove the Sticky Residue on Wooden Floors From Under My Rug

How to remove residue from under carpet from h/w floors?