Almost all stains are water soluable,and apply a clean, wet, white cloth while damping the spot will usually suffice/try not to smear and dab /also we carry cleaners specialty for removing glue on commercial installs,but a stain isn’t a stain until it ”sets in” so getting on it quick is usually the answer! White out is something i have never dealt with in carpet and by the post being a day old what ever you did…..you did..and whatever it is ..it is but any spray cleaner might help now -hope this helps.
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