Accessing Main Ducts
The areas you could not reach with the steps above are not likely to contain a lot of dust and dirt. However, if you are determined to clean every place you can, there are a couple more things you can do.
1. Remove end caps from rectangular duct work. If you have rectangular duct work, like in the picture below, you can remove the end caps to access the inside of the ducts. You can slide the "drives" down off the duct and pull the cap out of the "slips." So long as the duct is not butting up against the wall, you should be able to reach your vacuum hose in through the space uncovered by removing the cap, and sweep out any dust you find. You could even use a flashlight to look inside the duct for dirty areas.
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