last week i got my first system fitted as before we were all trad. Since then i have been watching videos and practicing on my own and family members windows. and everything was fine. today i tried it out on a few houses and have now just had a phone call saying the water has went through her vents and all over her windows and sills inside. how do you guys do first cleans with vents? not sure if i went over kill trying to get all the dirt off the top and vent. cheers in advance guys.