You are better off removing all the vent and getting into every area in the coach you can and break out the shop vac.
Same thing with the small styrofoam balls from the A/C vents. I actually removed the A/C vents and trimmed the styrofoam for better airflow. I got the shop-vac in there before, during and after trimming and we still get little white pieces of styrofoam in the coach.
There was a ton of construction debris under the bed. I actually found sheet metal screws and saw dust inside my transfer switch.
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