New Delhi, Dec. 9 -- Vacuum cleaners have changed a lot in recent years. Where older models had a single suction setting and maybe a manual boost option, many modern vacuums now come with auto suction modes. These vacuums adjust suction power automatically depending on the floor type or how much dirt they detect. It sounds impressive, but does it actually make your floors cleaner?

Experts say that auto modes are helpful, but they don't guarantee a superior clean on their own.

The simplest form of automation is the ability to distinguish between carpet and hard flooring. Carpets need stronger suction to pull out dirt from fibres, while hard floors only need moderate suction. Auto mode can switch between these settings without you touchin...