Cleaning involves removing dust and dirt from surfaces. It is done to maintain hygienic and safe environments, prolong the life of materials, and avoid contamination. There are two main types of cleaning equipment: mechanical equipment like vacuums that are powered, and manual equipment like brushes and mops that require human power. Factors to consider when selecting cleaning equipment include ease of use, availability of spare parts and after sales service, and cost. Common mechanical equipment includes vacuums of various sizes for different applications, as well as scrubbing and polishing machines, while manual tools include brushes, brooms, mops, dusters and refuse bins.