Cleaning storage grease from new brake m/c

[William Maslin <cwrm4@yahoo.com>]

Folks,

I recently acquired a new Girling brake master
cylinder to replace my troublesome cheap repro m/c
installed by the PO. 

The reservoir on the new m/c has about an 1/8" of a
brown cosmolene-like grease in it, some of which I
assume has intentionally made its way into the
cylinder itself.

Question: after cleaning out the reservoir, is a bit
of bench bleeding with regular fluid (Castrol GT LMA)
sufficient to "clean" this grease from the
cylinder/piston before mounting it on the car? 

Thanks,

William
'74 TR6

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