Some stands are made with Rubber that has solvents that 'bleed' into the finish. The finish and the rubber may have become one here and maybe thru the finish and into the wood. Cleaning this might require re-finish touch up. We use a mixture of oil type products to build up this finish and it is something we can not give away or explain. Also, the age of the bass and natural oxidation of the wood and finish overtime darken the color, so new finish will not blend in and be 'one' for many years if at all.
Try a cotton ball with isopropyl alcohol and rub gently with the grain if possible to see if it comes off without harming the finish if at all. Also, if you can rub with a paste wax that smells like it has turpentine in it, this might also lift the rubber OFF the finish if it is not already IN the finish.
Contact the company that sells this stand. Maybe they will pay to refinish your bass. This is not an easy or inexpensive job.
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