Reading all of the above, I can't help but wonder if it wouldn't be easier to get a gallon or two of vinegar from a restaurant ($2.50/gal), and use it for an acid flush
After all, I believe acid is pretty much acid,- the strenght is what's important. This makes me start to suspect that MB uses a powder because its 'safer' than H2SO4 if you spilled it on your hand or other extremity. (ouch! )