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How an Automatic Vacuum Cleaner Can Save You Time and Money Automatic vacuum cleaners can eat an enormous chunk of your list of chores. They can be used in difficult-to-reach spots like behind sofas and under beds where dust collects. Smart vacuums use advanced sensors to map their environment as they clean, while roller brushes and side brushes move carpet fibers and scoop dirt into the suction mechanism. Some even self-empty to avoid messy bag changes between sessions. Adaptive Cleaning