Weeds growing through gravel my gravel driveway.? What's a good 'enviroment friendly' weed killer? Someone suggested Borax. Have you...

What's a good 'enviroment friendly' weed killer? Someone suggested Borax. Have you hear of that, and if so how does one apply it? (as a dry powder or liquid solution) Also any other good suggestions will be appreciated.
Spectricide Triple Strike works better and faster than Round Up.


I hear it you put boiling water on weeds it will butcher them never tried it but people told me it works that sounds as environmental friendly as you can get I newly got this few days ago and it working great so far for me.

http://www.thehardwarecity.com/?sku=2848...
Answers:    50/50 river &bleach.Spray it on i do it in my driveway and no grass or weeds.