Always good to be reminded of the right way to do this. Don't know about others, but sometimes I get a ittle "lax" on this, and neglect some things. I never really aspirated and have been lucky about that I guess, and I'll admit I've used the same pin twice in a row before discarding many times. I will say I've always overdone it with the alcohol, always feeling more is better, and it is really inexpensive.