Acid isn't solvent. It isn't a matter of being "stronger" - it's different. Apples and oranges. HCL won't touch wax. Most petroleum based solvents will disolve it. <shrug>
As for the warranty, this is their out: "and numerous other strong chemicals"
They didn't say WHICH other strong chemicals, and they can always say that whatever you used wasn't one of them.
But that really isn't the issue. They aren't claiming you damaged it with a solvent that wasn't covered by their warranty. They said you used an abrasive, and you have to be pretty stupid to not be able to tell the difference between solvent damage and abrasive damage. IOW, they either don't know their rear from a hole in the ground, or they are just making excuses.
From the other comments on that link, it's pretty clear that this stuff is not worth the money.
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