Maintenance Treated Glass
Mix 3-4 capfuls of mild detergent per litre of water in a bucket. Apply to the glass with a non-scouring pad/ t-Bar with woolie and agitate. An efficient way to approach the job for exterior glass is to fix the pad to an extendable pole.
After agitating, run water down the glass with a hose wand attached. Water will descend down glass resulting in very little moisture left on the glass. Any drips remaining can easily be removed with a clean dry cloth or squeegee.