This is an unparalleled cleaner for all types of metal. I love to use it on stainless steel, it works really well for sinks, appliances, etc. It never ceases to amaze me how much dirt comes off, that's invisible to the eye. For this purpose, make certain you use it exactly as the directions state, use a soft cloth, and go with the grain of the metal....it's much easier. It also works well on base metals, and I've used it on some of my pieces of jewelry too! I love that it doesn't have any fumes to contend with, and seems much gentler than many metal cleaners I've tried in the past. You don't get the feeling you're wearing away the finish with this product. It also leaves no residue. That's a problem with oily stainless steel cleaners for appliances, they tend to attract dirt very quickly. I really prefer Flitz, but if you plan on doing larger areas, especially on a regular basis, make sure you get the larger (7.6 oz) size. I haven't tried Flitz on plastic or fiberglass yet, so I can't comment on how well it performs, I'm impressed enough with how well it does on metal!