I sprayed a lawn with revolver out of a 100 gal. skid and was wondering if I needed to clean the tank before using it on Fescue? I used all of the Revolver that was in the tank and ran a little water to get what was in the pump and hose out. I know I still have some residue in the tank but if I add enough water/preemergent to do 1 to 1.5 acres will it be diluted enough to not harm the Fescue? I usualy don't flush any of my spayers when switching chemicals but was wondering about the revolver because it states on the label to wash out the tank after spraying.