Yeah, I always thought that seemed like a stupid idea (and have never done it). By taking out the cartridge, blowing on it, and putting it back in again, you are in effect:<p>- Taking it out<p>- Performing a pointless ritual<p>- Putting it back in<p>In other words, you are re-seating it, which really does help. So just skip the blowing on it step and get the same results without corroding anything.<p>If there is actually some detritus on the contacts, clean it with some air duster or isopropanol on a cotton bud.