| I believe the pump is anodized aluminum. If you research what chemicals are used to strip old anno you should find something. You could physically remove it by polishing but you will probably have much better results with a chenical dip.
Many people strip the paint off the grip frames and polish them. You can probbaly blast it off or use a chemical paint striper. Then use a fine grit sandpaper to polish it nice and shiny if so desired.
One critical point to note is that both the pump and frame will corrode over time with exposure to the elementsif left as bare metal. To maintain the appearance you will need to continualy polish or coat them with something. |