No, that makes chlorine gas and etches the copper besides.
You can try >= 50% sulfuric acid, which will hydrolyze the cellulose, turning it to a gel at first, then becoming soft enough to wash away. Tends to affect the toner, though.
H2O2 + sulfuric acid will etch copper, which might be more pleasant than HCl.
I think HCl is usually recommended just because it's so easy to get. It's just about the most noxious option -- moreso than FeCl3, which is a salt (if a rather acidic one), rather than pure volatile acid.
Sulfuric acid is (readily?) available as drain opener, check the label.
Remember "do as you oughta, add acid to watta" applies to sulfuric acid. Muriatic acid doesn't matter because it's already a solution. Sulfuric acid is rather more aggressive, because it's high concentration (>92% usually), and this precaution must be followed.
Tim