See figure 1.3a - https://www.gov.uk/government/publications/migration-advisor...
Note that to the best of my knowledge, these numbers don't include the Afghan resettlement scheme which would further lower the proportion of employment driven visas.
For cleaners it's a little less clear which employment visa they'd have been more likely to use. Potentially either depending on the specifics of their job, their income and the precise definition of skilled worker.