Welcome to the forum its a great place to get your questions answered. when you say clean are you talking about the furnace or the blower sections? For the duct work (I have no idea how much you have with at said remove the cold air return use cardboard and make a block the same size as the return tape it tightly to the return cut a hole in the cent and tape a shopvac suction hose to that. Then put cardboard covers over all the registers (after register removed) with the vac running use high pressure air to blow thru one duct run at a time then recover. JMHO
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