I need some ideas on a large storage lot that I spray for a Bridge company. It's covers approx. 6 acres with I beams, forms and alot of other misc. I sprayed it twice last year, once with glyphos and the 2nd with glyphos and Diuron as a sterilant... The 2nd app. was later in the year with little rain afterwards... I was not impressed with the performance of the Diuron. Is there another product or products that I can use for sterilization? I want to treat this property earlier this year and only once as it's a pain to spray in the first place.. Thanks in advance for any suggestions!!