All the people I know take this approach to their windshield wipers:
1. Damn, it’s not wiping that bit properly. Oh well, I can still see.
2. Hm, now a quarter of the window is blurry. But it’s not the driver side quarter, so it doesn’t matter.
3. Oh look, a dude selling cheap wipers on the side of the road, I’ll have 2 please.

It never even occured to me you could sharpen your old ones. But Japan knows everything! Enter the Windshield Wiper Sharpener.

One thing’s for sure: at $5, it’s much cheaper than a pair of new wipers, so it’s worth a shot. Yeah, it won’t extend their life a lot, but it’s better than nothing and useful to have around when you realize just before a long trip that you should’ve changed them.

How much under $29.99?
A lit: $4.90 on DealExtreme.com.

Via GearDiary