A type Overdrive

[<ow@tquest.org.uk>]

Hi chaps, I'm preparing an A-type overdrive for shipping and need to clean 
the inside.  Do you think that normal water washable de-greasers will damage 
the friction material in the unit?  It's just that the workshop manual 
insists that no friction reducing additives be added to the oil for obvious 
reasons and I was wondering if the de-greaser may harm or impregnate the 
friction plates in the same way.  What do you think?