Simple Green is a houshold cleaner degreaser. I got a spray bottle at the hardware store. Some grocery stores might carry it. Coca Cola , should also work.
The clip is a spring loaded alligator clip like battery chargers come with that is attached to the wire. You just clip it onto the titanium and lower the metal by hand into the solution.
The color is permanent and irreversible. An oxide layer grows inward from the surface of the part as you anodize. The surface becomes non-conductive after the process is complete so no further anodizing can be done. Only way to remove the color is to polish away the anodized layer which is quite hard.
Other colors can be incorporated in the anodized layer with a dye process. The freshly anodized wet part is soaked in Ritz dye that is used to dye clothes immediately after.