Emptying the dust collector or replacing the dust bag regularly as it fills is one of the easiest things you can do to improve the suction quality of your vacuum. As your vacuum collects dirt and dust, it builds up and begins to obstruct air flow throughout your vacuum, reducing the suction power in the process.
This principle also applies to the vacuum cleaners’ filter. Depending on the model, the filter may be cleaned by brushing off collected dust or washing it in water. The filter may be a foam block or a mesh and some may need to be replaced rather than cleaned, so always check the user manual to see how to take care of your filters.
If your vacuum head has a roller or brush inside, check to make sure it is clean and not being obstructed. Longer hairs, threads, dental floss and stray shoelaces can get wrapped around a brush head to stop it from spinning. Scissors work well for removing these if they can’t be easily pulled away by hand. Be careful not to cut the bristles.