This works! I just tried it on a HP Plotter (which has ridiculously expensive cartridges). How to get the last ink out of the ink cartridge.
My mother taught me this trick. Ink linked on to our rug and she said just use hairspray to clean it. I tried it and it worked. She said she would use hairspray for removing ink from her work shirts all the time. Thanks mom...I still use that little trick now I will share it too.