Do small steam cleaners work well?

https://www.bustle.com/p/the-4-best-steam-cleaners-for-grout-22816987

Are there any affordable steam cleaners that can do both automotive engine compartments and bathroom/shower stall work?

I have a wallpaper steamer and have thought about using it for my shower and car engine compartments. Haven't used it on anything other than wallpaper yet.

Waste of money... no power in them

Several Youtube videos showing them steaming everything from bathroom tile to greasy car parts.

We have a "big" household unit. It does a pretty good job on stuff inside the house, but expect to have to stop and refill it often. If you need to really clean under a hood that is an oily mess, you will be there all day. You get about a 3' square of decent clean per refill, but you will be redoing about the last 1/4 of it after a refill. The process of refilling takes about 10 minutes, so whatever you were cleaning gets cold and you pretty much have to warm up the edges again.
Under hood would be better with a pressure washer with a good degreasing soap down first. Gene