use common sense... gasket is cardboard, silicone, or whatever... you use it to remove the baked on s***... what makes you think it doesn't have something to break it down into goop? ok, so what needs to happen to break those solids down? something acidic
what does acid do to paint? EAT IT UP
what is adhesive cleaner? it's petroleum based compounds or alcohol based... it's far less acidic
next time THINK and read labels on packaging before doing anything
Actually, this is completely incorrect. The chemistry here is so bad...
Methylene Chloride is the active chemical in most gasket removers. (It also removes paint as well...) You can find products without it, but they are rare.
Methylene Chloride, is neither an acid or a base just for the record.
Most car "cleaning" products for engine use are petroleum based with alcohols used as propellants / solvents. The reason is that the high volatility of the alcohol means it evaporates quickly leaving only the reactive agents. And since hydrophobic compounds like oil, grease, gasoline, are mostly insoluble in water, you need a oil based solvent. This is why they use petroleum based chemicals. I am sure most of you already know that if you want to clean a dirty PVC value, or something with grease / oil on it, gasoline works pretty damn well in a pinch.
There are many cleaning products that use strong bases, but not acids. Acids are rarely used in ANY commercially available products. Bleach, almost every drain cleaner, brake dust cleaner, etc., are all strong bases.
Not trying to bust on you (The Man), I just hate to see bad information spread.