Please advise which hose sprayer to purchase in order for the spray to reach windows on the exterior second story of a house.
Two of my favorite HOSE END SPRAYERS I like to use for reaching up high would be our 6 GALLON HOSE END and our 20 GALLON HOSE END. I especially like these because I'm able to mix up both liquid and wettable powder concentrates in their chemical "tanks". Not only can I add any type of product but I can add different products at the same time and make a sort of "cocktail" mix. Having a sprayer that can combine all these components simultaneously saves me time and effort when I have more than one product to apply.
Oh, and don't rule out our TROMBONE SPRAYER. It's not a hose end design but many people like it for a wide range of application needs and since it too can spray so high, it's a good choice for reaching the second level of most any house.
Here are direct links to the products listed above:
Hose End Sprayers: http://www.gotosprayer.com/sprayers/hose-end-sprayers
Trombone Sprayer: http://www.gotosprayer.com/sprayers/pump-sprayers/trombone-pump