Preparation Most employers do not require any specific education or training for janitors. Beginners should know simple math and be able to follow instructions. High school shop courses are helpful for jobs that involve repair work. Mechanic courses are helpful because minor plumbing or carpentry work may be part of the job. Some jobs require a driver's license and transportation.
Most janitors learn their skills on the job.
Usually they work with an experienced cleaner, doing routine cleaning. They are given more difficult work as they gain experience. In some cities, programs run by unions, government agencies, or employers teach janitorial skills. Students learn how to clean buildings thoroughly and efficiently and how to select and safely use various cleaning agents. They also learn how to use and maintain machines.