Nah, you blow on the slot it goes into after licking the game because you don't have rubbing alcohol and water seems too dangerous.
Wtf, you never had to blow DS cartridges. The pins are exposed on one side and just an old toothbrush could be used to clean them off.
Blowing on things like game cartridges and connectors is really bad for them. It causes corrosion.
The connectors are gold. You ain't gonna corrode that. You could, however, get saliva on them and cause a short.
Some connectors are gold. In specifically read the ones in old NES cartridges are prone to corrosion.