In general duct cleaning is not needed (IMHO). You will always find some dust in any AC system, this is NORMAL. As noted above, the flexible ducts can easily be damaged. The dust that settles in the AC system will stay where it is, it settled there because the air flow is slow there. Change your filters as recommended, and if you are having a project that will create a lot of dust, have that area closed off and the AC vents closed.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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