Yes, someone who starts out cleaning does learn skills. They can become better at cleaning than the average person. They will know how to clean really bad messe

Yes, someone who starts out cleaning does learn skills. They can become better at cleaning than the average person. They will know how to clean really bad messes without getting grossed out by it. They will know how to dispose of the stuff they clean. They will know how to clean efficiently and without wasting time. They will know what type of cleaning supplies to use. That may not make them a manager, but there are jobs that pay higher than minimum wage that require the ability to clean as a skill. Often those jobs come with new skills to be learned. And yes, someone who has some degree of management potential could definitely start out cleaning toilets for minimum wage and work their way up to managing the cleaning staff somewhere.