5 ltr spray pump. Cut the 6mm hose and fit a quick release rectus fitting either end.
Get some pole hose n fit corresponding fittings.
Unger telescopic pole and fit the spray end inside. Run hose through pole to the trigger and attach at bottom of pole.
Then connect all up with the rectus fittings (easy for storage this way) and you can spray directly onto the desired object cutting down drift.
Or for lower down easy to reach areas, a small hand held push pump hozelock.