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When I worked on the IROC race team, we flushed the brake fluid out of all the cars after every race. We had pint brake fluid bottles with holes drilled in the caps that tygon tubing fit tightly in. Putting the tygon tubing on the bleeder screw makes a very clean way to bleed brakes. After you are done at the wheel, a shot of brake clean in the bleeder screw and you are done.
We would suck the fluid out of the masters( there were 2) and fill with fresh fluid before starting. With the bleeder bottle you can also keep track how much fluid you have taken out. I flush the fluid on my car every season.