Excuse me, what is the occupation of cleaning the external wall at high altitude?

Cleaning the external wall at high altitude belongs to 5-6 professionals. Employment age is 45 years old. Aerial work is divided into 5 meters below and 5 meters above. Generally, people below 5 meters belong to Class 2 occupations, and those above 5 meters are divided into 4 categories, 5 categories and 6 categories according to different types of work.

I hope it helps.