95 Ford 150 slave cylinder?

I was wondering if anyone knew if there is a way to bleed the clutch master or slave cylinder, my clutch is catching a hair off the floor ....I had to add fluid because it was all gone....may have a leak in slave cylinder ....but dought if anyone ever checked the fluid in it before....anyway it was so low it got air in the line....it really hasn't went down any in the last couple of weeks since I added fluid, but have to push pedal all the way to the floor, to release clutch.