Whats the best way of getting tops of frames cleaned on first cleans where there is air vents, i usully turn water flow off and give a good scrub but think the dirt gets agitated just and doesn't wash away properly with water flow off especially when really dirty. Was thinking of keeping water flow on high flow scrub and wash away all dirt knowing water will get into air vents, then finish house and go back to start hoping all water will have dripped out of vents and doesn't run unto clean windows. does anyone else clean this way or got a better way because i think thats where most of dirt build up does be. Wayne