DP MYTHBUSTERS : Blowing in NES Cartridges

[slapdash]

But they are meant to be used in humid environments, though.
Professional clippers and trimmers are supposed to last forever, but you're right about consumer electric razors. Those things last a couple years at most.

For what it's worth, I bought my razor in 1988. I have to replace the blades/heads every few years, but it's still going strong almost 24 years later.