Easiest 727/904 rebuild thread...
So again trying to kill the time space and tool myth... I just had a horrendously dirty case and again recapping that I hit it with the power washer out on the front driveway which of the guy didn't have one could use the one at the local car wash... Then I soaked it in WD-40 and took a screwdriver and scraped off any heavy stuff I could and took it out back on the patio on a fold out card table that I got for free sitting out across the street from a customer's house and he grabbed one too and we both used them for just this purpose.. anyways I would go out for 10-15 minutes each day scrubbing with a wire wheel wire brush and redoucing it in WD-40.. the other day I gave it one last power wash and called it good... So far tools were just wire brushes wire wheels on my drill a screwdriver and a pick tool to scrape with and WD-40 and my power washer. Each day I only took like 10-15 minutes just kept poking away at it till I got it reasonably clean.
Hopefully most of you don't have a case this bad and can skip 90% of the step and just give a quick power wash or something and be done with it...