/diy/ - Do It Yourself

2 questions regarding killing grass/weeds.

1. What's the best way to keep a sprayer clean and working effectively? For some reason mine always tends to get clogged. A whack against the sidewalk usually takes care of whatever is causing the clog.

2. With all the talk about roundup and cancer, I've tried the vinegar + salt + Dawn. The results were quick, but short lived. Within a couple days, the grass in my driveway was back to green. Anyone else have luck with this mixture?