I have been in lawn care for a year now, but am not sure which herbicide would be best to use for around buildings, fencelines, etc; basically anywhere you do not want anything to grow ever. Last year, I used glyphosphate, but with the amount of rains we received, I had to make more frequent application then desired. I do a good bit of commercial lawn care, and recently obtained my pesticide license. I basically am looking for a the most persistant, nonselective herbicide I can find for this purpose. Any suggestions?