It's probably the window cleaner that attracts the dust on your marbles. They just want you to use more of it. The greedy little beggars.
Paper towels can also leave dust particles use a clothe instead.
Try some white vinegar its a lot better for cleaning glass to start with.
Also your glass is likely to have a static electric charge on the surface by it's very nature.
I don't recommend shooting in a macro mode. Macro modes will show every spec of dust and magnify every imperfection there is and may even invent some of its own.
Today's digital cameras are way overkill for most purposes. Shoot in another mode and crop the image down, it will still be a large image with better results.
Lots of people think that they need to be really close up to get a good shot of something small. Not so when your photo is the size of a movie poster.
In other words where I used to fish, the photographs alone weighed over 3 pounds!
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