WD-40 can also work for removing rubber marks.
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Some marks cannot be removed. Could there be actual bonding of atoms? Who knows? Sorry to bring bad tidings. But the good Gnus 🐂 🐂 🐂 is that the Sorbothane itself was removed. One of the biggest scans ever perpetrated on gullible newbies. Sorbothane isn’t even very good as a running shoe insole, if you ask me.
Another product marketed for vibration absorption is the blocks of cork sandwiched between layers of ribbed black rubber. Those also will stain any finish you put them on. They left permanent marks on my clear maple flooring and the stain seemed to have gone through the varnish into the wood itself. Even refinishing the floor didn't completely remove them.
They seem to have varied industrial applications. $11.00 for a set of four probably makes them unsuitable for audio use, based on price alone: