the words "washing", "brushing" and "cleaning".

The words "washing", "brushing" and "cleaning" are affixed to the pools of restaurants, which correspond to their respective functions, namely, removing residues, removing oil, and soaking a pool with disinfectant.

catering, also known as catering, is a food production and operation industry that provides consumers with various drinks, food, places and facilities for consumption through instant processing, commercial sales and service labor.