I have found my ultimate way to clean glass...
We have a single-stream recycling pick-up every two weeks - that means all cardboard, pasteboard, plastics (not bags, but bottles, milk jugs, etc), unbroken glass jars/bottles, aluminum & steel cans (we have a list!) can all be collected and put into the bin. Then it is weighed and we get "Recycle Bank Points" for it. WIN!
Keeping several bottles of water in the car in those little side pockets on the door, you know the ones that normally collect debris or trash. Stays cold all winter! Last summer, I really didn't mind the warm water. At least I had water. What started out as an accident has become a habit for me!
Place piece(s) of fruit-melon/banana/etc-at the bottom of glass jar. Create a cone out of paper, balance on rim of jar so the opening at the pointy end is just big enough that a fruit fly can get through & does not touch the fruit at bottom of jar. (See more info for rest)