SWIM suggests letting it sit to make sure it is really dry, then it can be scraped off with many things, even a dentist tool to clean teeth, long, thin and has a metal curve at the end.
All illegal narcotics are medicinal. Boredom is a disease worse than cancer. Drugs cure it, with little or no side effects if used as directed - Doug Stanhope.
Rightful liberty is unobstructed action according to our will within limits drawn around us by the equal rights of others. I do not add 'within the limits of the law' because law is often but the tyrant's will, and always so when it violates the rights of the individual. - Thomas Jefferson