I use the smallest amount that will get the job done. Of anything.
I have rigged up a way to wash my outside windows. I have a paint pad that was meant to be attached to a handle. I used a broom handle and have a square bucket. I use ammonia outside and can reach to the top of outside windows with my wet pad to rub a little. Then I use my 16 in squeegee at the end of a long stick to rub down the window to get the wet off. After that, I have another long stick with a rag tied to the end to get into the corners if needed. Not a perfect job, but good enough for me. I can wash all the windows on the outside of my house in about an hour. 36 individual windows and 7 doors with glass in them. That includes the garage and breezeway, as they are attached.