I arrived home from a four week vacation to discover that my gravel driveway is choked with weeds overflowing from my neighbor's unmaintained yard. The amount of weeds is quite overwhelming. I also tried to weed the driveway last summer, but I must've failed to get the taproots because many of them came back this year. I don't want to use pesticide because of the number of cats and other creatures that walk on the driveway. Can I pour boiling water over weeds to kill the entire plant? I realize this will be time consuming, but certainly no moreso than spending every weekend weeding my godforsaken driveway. Thanks for any input.