after reading Maine's latest post, I don't think I'll be trying the oxalic acid on the stainless anytime soon. Makes sense too as I scrubbed my deck with water / oxyclean mix (suggested by the yard when I bought the boat, I guess it has a small amount of oxalic acid in it, I don't have any nearby to verify this though), and the base of the pulpit has rust stains around it now that I haven't been able to get out too easily. I am going to try the stainless cleaner, and hope that it leaves the stainless in a better condition than the oxycleanDear Fourpoints:
The finish dulling I observed was on the ss backside of a check block that before the oxalic acid was really shiny -- except for the little bid of rust around a weld spot. After the acid the rust was gone. But also the shiny adjacent surface was converted to much duller metal gray.
I did not take a picture of this because the difference just wouldn't have been picked up by a camera. But yes, I've got to learn the close-up focussing technique on my camera better. The close-up mode seems to be tempermental. This time, the background surface is in perfect focus but the object is a bit bluring. Anyway, the pics do show: Rust before ... No rust after.
as far as the camera goes, mine takes great macro shots, as long as the camera is zoomed all the way out. if I zoom it in even a tiny bit, it will not focus on anything.
Maine, thanks for the info. super informative as always...