The specs of saliva that go along with blowing corrode the contacts over time, so it is actually better to find an alternative with a soft brush and non/less-acidic cleaning solution.
Nintendo sold cartridge cleaning kits in the 90s (maybe even the 80s).
If we had Atari cartridges in 2025 kids would be buying kits to clean them and blow into them.
The specs of saliva that go along with blowing corrode the contacts over time, so it is actually better to find an alternative with a soft brush and non/less-acidic cleaning solution.
Nintendo sold cartridge cleaning kits in the 90s (maybe even the 80s).
No one bought those. By the time any corrosion occured, you mastered the game.