I'm curious....what do you all do with clients who have concrete or brick walkways and driveways that have weeds coming up in them? Do you (1) use your string trimmer to trim them down flush, (2) pull out the sprayer with roundup and spray them, (3) hand pick them out, or (4) nothing....the driveway weeds weren't quoted as part of the job! The reason I ask, is because my last client had a driveway full of weeds.....I trimmed them down flush to the pavement, but they'll surely be back next week. What do you all feel is the most professional solution? Thanks!