I’m sure there are nuances that most people won’t think of. But teaching it doesn’t require anything more involved than a YouTube video. Not $560 of coursework. 20 people sitting in a classroom? The instructor gets $10k? Scam.
Speaking of which, what about on the job training? Why do you need a training course to get this job? You can’t apprentice with someone?
You can learn a lot from YouTube but how much trust would you put in a new hire when you ask them "can you do this job" and they respond, "eh, I'll look it up on YouTube"?
In this way you know the person has been trained to clean. At least in theory. Reality might be quite a different thing.
As for on the job training few companies have either the time or inclination to do so. Mostly because, I spend my time training you to do the job properly and you quit and go to another company to use the skills I just taught you.
Some companies that do train are starting to say if you quit in less then six months to a year after your training is complete you will be billed.