WEAR GLOVES
Gloves must be worn when handling chemical containers, preparing and diluting chemicals, and cleaning using chemicals.
Even the mildest detergent can emulsify dirt and grime, so skin can lose its natural oils, leading to dermatitis. Many other chemicals are more severe so gloves must be worn.
This also applies when spraying and wiping surfaces with a cloth. The cloth gradually absorbs the chemical which, without gloves, will come into contact with the skin.
NOTE: Gloves are good to help cleaners avoid coming into contact with germs and bacteria.