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Cleaning liquids may actually embed the dirt into the painting and cause permanent liquid lines over the surface. In fact, it is discouraged to use any liquid, including water, to clean the surface of your acrylic painting. Do use compressed air in a can to blow away surface dust.
Re: How long does acrylic stay wet on canvas? I use a home-made stay wet palette and some glazing or blending fluid--actually a lot of glazing or blending fluid to thin paints down and keep them workable. I have been able to get smooth transitions of color and value, so I don't see much advantage to oil.