Pressure washer for driveway crack weed removal?

[Maddog]

If you already own one of those portable propane torches; you know, the kind you use to sweat pipe joints, etc. with, then go out and run the torch over the weeds. You won't be doing any visible damage to them, they will just move around like there is a light wind moving them. About a week later, they will be wilted and dead. I would go for the pressure washer at that point.