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

What is this white substance under carpet pad? : r/centuryhomes

Was pulling out a nasty carpet from the previous owner and discovered tile under the boardsis that white stuff asbestos? : r/CleaningTips

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How to remove carpet under pad marks/residue? : r/CleaningTips

hardwood floor - Please help me identify this 1927 flooring found under carpet? I need to buy 30 feet for repairs - Home Improvement Stack Exchange

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How to remove these white water stains from laminate flooring? : r/howto