NON-EXPERT ANSWER:
At 02:07 PM 12/4/2010, Edward Maglott wrote:
>So my question is how to get it ready to actually use.  I'm afraid
>that blue-green fluid might be DOT5, which VW warns me even  a tiny
>amount will contaminate my brake system and lead to
>disaster.  Anybody know about colored brake fluid?  To get it cleaned
>out, I will do the following:  Bring it into my nice warm dry house
>for a week or so.  Put fresh new DOT4 fluid in it, swish it around,
>flush it out, and repeat.  How many times should I repeat that, or
>should I clean it with brake cleaner or something else?

If the DOT5 fluid is not completely soluble in DOT4, you won't get it
clean that way.  I don't know about colors, sorry; although
blue-green might indicate copper contamination from brass or copper
parts in the bleeder.  If google or someone here doesn't help you,
talk to manufacturers of brake fluid.

>Once I get this cleaned out and use it, how should I store it to
>prevent moisture contamination in the future?

Store it empty and dry.  Use new fluid from sealed i.e. new container
each time.

Yrs,
David