Tiny little reservoir is clutch fluid.
This is the way I do the powersteering - others might do it differently. I undo one of the hoses form the powersteering reservoir, drop that fluid, suck the rest out using a mitivac, put hose back on, fill it, jack the front of the car up, and turn wheel side to side. Easy. I know that my method doesn't get out all the fluid, but it doesn't matter. My fluid was clean, so refreshing it was just for fun anyways. If its dirty, I do my method a couple times.