If you have hardwood , vinyl plank , or laminate floors, you are probably protecting your floors with a floor protector of some sort. Having furniture on carpets, rugs and floors will at some point leave an indent in your floors. For instance, under my computer chair I protect my floor with a chair mat. Under other chairs I use a felt floor protector, it saves your floor and allows the chairs to be moved easily. Eventually you'll have to replace your felt pad. After removing dirty pad, I clean bottom of chair leg with residue remover, like isopropyl alcohol. That way when I apply the new pad it will have a clean surface to adhere to.
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