Since I was bleeding the clutch master cylinders by myself, what I did was buy one of those bleeder kits like this:
- hooked the long piece of clear tube line from the bleeder hole on the clutch slave cylinder to nipple on cover of the cup
- hook the small tube at the bottom end of the nipple on the cover of the cup
- fill the cup 1/4 - 1/2 of brake fluid
- attach cup to the cover and put it down on the ground
- Use your hand and slowly pump the clutch pedal
may take 10, 20 or so pumps, but keep pumping untill you see clear brake fluid come out in a stream.