Rubbing alcohol/ethanol/etc isn't the most concerning thing, it's the detergent/surfactant(s) that concerns me.
Those generally stick around to whatever they're applied to and can cause everything from a surface that is prone to environmental staining to a negative effect on the bonding of fibers in the paper/cellulose. It can also effect the moisture content of the fibers (and between fibers) which are effects that won't show up until many years/decades later.
Using the 2nd chemical "polish" just compounds the possible issues by locking in the detergent/surfactant into the card.
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