How do you clean out a gearbox?

[Dennis <IEDXW@ASUVM.INRE.ASU.EDU>]

Here is the problem:  I have an overdrive greabox from a 1980 spitfire I
plan on fitting to my Midget.  It was from a car which had a fire so most
wires are fried.  I want to thoroughly clean the inside of the box and OD.
How do i do this??

I thought about using gas.  Drain the box, fill with gasoline, slush around.
Drain and repeat.

Any better solutions would be appreciated.

Cheers Dennis