I think ZUD is a little stronger? Not sure if same ingredients or not. My mom had told me about ZUD for removing metal marks on dishes (and inside coffee mugs, though I don't keep up with that I'm sorry to say) years,and years ago, so I've had it (powder) in my home ever since. When we purchased our A-C pots and pans our Le Creuset DO, the salesperson recommended BKF (powdered form) for cleaning them. Really makes a difference using it vs. not--removes the "film" that seems to remain after cleaning them with just dish soap. I use BKF on my Wolf range burner pans, on the underside of my hood when it needs it, on my sink.... I had gotten Cameo to clean up some of my old flatware pre-reno so kept that around. I think it's milder than BKF, maybe a little less oomph for some of the grungier cleaning jobs??? It might rinse away a little more easily than BKF (all the powdered cleaners seem to require a lot of rinsing, esp in our 0-radius sink with its flatter bottom). Depending on how grungy the sink is to begin with, and on pure whim, I'll grab one, or the other (BKF or Cameo) to clean it. Oh, I'll also use a small am't of BKF to remove mineral deposits and/or really stubborn soap film on our fireclay/porcelain bathroom sinks if our spray bathroom cleaners aren't successful. HTH!

Is water natural enough for you? I find a wet microfibre cloth is all I need to clean up streaks and fingie prints. But for gunk burned onto the cooking surfaces, you'll need something stronger. Generally, I use a soapy plastic scrubby, but for more stubborn stains, I use Bar Keeper's Friend. A more "natural" abrasive would be baking soda, but I don't find it works anywhere near as well as BKF.

Interesting. I love Simple Green as a degreaser and excellent all around cleaner. I know it has directions to use it in the laundry so I guess it's only natural for them to expand in that market.

Can't help with SS because I don't have any (yet). I have a house full of "real" hardwood floors finished in plain old polyurethane. I just damp mop with a small amount of vinegar in warm water. I use a mop that has the microfiber pads that just velcro on to the base....LOVE those things! I also use this type of mop to wash walls with. I sweep/dust my floors with Swiffers. I will use my soft-bristed Old Cedar broom occasionally if I have had a busy day in the kitchen and have lots of crumbs on the floor or if "grit" has been packed in at the entry way. sweep with a soft-bristled Old Cedar broom before swiffereing. Here is a link that might be useful: Microfiber Mop similar to mine