Did I mention I've been cleaning and re-filling ink cartridges for years now?
I've had many cartridges that just wouldn't cooperate unless I soaked them in alcohol, usually the ones that have sat in the printer for long periods of time without being used. It's like the ink is caked up inside the print heads. For some reason it seems that HP cartridges are more famous for this, don't know if it's because of the type of ink they use or what. Their inks are also famous for foaming and you have to really sloooowly inject the ink, and even then it foams, causing air-lock.
As for the flammability of every day rubbing alcohol, it's so weak I have a hard time lighting it unless it has a wick, like a paper towel.
I've tried using alcohol to burn stuff before, and it's flashpoint is just too darned high. Now good ol' fashioned White Lightening on the other hand.......
But then who would want to burn that?