OK, I kinda get that analogy, but at the same time I think it only holds up for something like rubber cement which can in most cases be rubbed off (hey now!), but when the card as a whole has to be dipped to remove glue, I think it gets in the gray area of doing overall damage to the integrity of the card.
So using your analogy, you would clean the bird poop off the '63 by submerging the entire car in water to remove it. Though you have removed the blemish, you have compromised the card as a whole in the process.
Splitting hairs I guess, but I feel it is a bigger deal than just a surface removal, and either way, the card is altered in my opinion.
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