Re: Cleaning AR88 Gearbox
In the past I've cleaned AR88 gearboxes by soaking them in Diesel for a week or so - it's sufficiently penetrative to get into the grease between the meshed gear-segments, and no worries about aqueous 'solvents' being left behind in any places where they may corrode (I'm particularly thinking here about the ball-bearings-running-on-steel-shafts: such surfaces can develop surface-rust in minutes if left exposed and damp).
Dunk in a tub of Diesel - swish it about a bit every day for 10 days or so, turn the gears through their full travel each time - then at the end dry with compressed air.
Relubricate the gears using a thin oil - I use ATF automatic-gearbox oil, and something like the semi-fluid moly-grease used in Land-Rover steering-swivels for the ball-races.
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