I will have a look at that. I loved having a steam mop for our tile floors in Florida. We do have tile in our bathrooms, but mostly we have LVP floors. Which I can’t seem to do a good job of cleaning. No stream allowed on those 
I have to say that I had great success on my shower glass today just with a Magic Eraser followed by the vinegar windex.
This is the steamer I used (actually bought it to wash windows). It has a squeegee attachment, so works on vertical surfaces:
https://www.amazon.com/Wagner-Spraytech-0282014-Demand-Cleaner/dp/B01JYVLF0Y/
Oh, gosh. Pretty big. I don’t have a ton of storage space.
I have ordered the battery powered brush thingie that @abasket linked. That should work great on the shower walls. Some reviews also mentioned it cleaned glass well, too. We shall see! And I’m still going to get the Wet and Forget and change out my shower head so I have a sprayer for rinsing.
But, I’ll file this away if other efforts fail - thanks for linking
Bummer about the storage. I keep my under the sink in the bathroom. It is actually quite compact.
Here is a small one (handheld) that seems to have good reviews:
This shower head works for my mother in her small shower. She likes to spray the shampoo that gets on the wall, and the corners of the shower. There currently is $10 off.
https://www.amazon.com/gp/product/B08WRKCWHB/ref=ppx_yo_dt_b_search_asin_title
As she can’t reach the shower head, I put a shower head holder lower on the wall for her. I can’t remember if this one came with it, or I used one from Home Depot. We looked at several shower head and some came with it, and others didn’t.
I feel like if you get delta from a plumbing supply store you are less likely to get plastics parts than a HD or Lowes. For example, possibly a greater percentage of metal vs. plastic parts.
Shower head threads are pretty much universal.
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