Ouch! That is indeed bad.....but hey, we're still human, and humans make mistakes sometimes. I know I will feel bad for quite some time about that stupid battery, at least until there is a decrypted romset available

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I almost made a mistake like yours with my Sagaia cab. The marquee is printed directly on the backside of the glass. While I was cleaning the front side I thought, hmmm, let's clean the back too while I'm at it. Thank god I noticed that the paint is coming loose of the glass, if I went over that with water or anything else I'm sure the paint/ink/...? would be flaking off too.
Is there anyone who knows how to protect the paint from flaking off? It's coming loose but there's no parts missing -YET-.
I'll try to find someone with a good scanner to scan the marquee, so I can try to vectorize it -just in case-.