I used simply SOS pads and water..removed all the oxydation and stains. Looked really good but not at a shiny plastic luster..
If a guy was to finish off with the higher grit paper and wet sand it would come back pretty quick I think.
You might try that next time 'rubbersalt'..you might be able to skip a few of those steps and save some time.

I didn't think to get a before pic, but here is the after.
Current toys..
1986 Honda 350X..trail bomb!
1985 Honda 250SX..my main mudder
1985 Honda 250ES..Back in Black Trike
Current non-trike toys:
1990 Honda TRX300FW
1995 Seadoo GTX
1998 Polaris Indy Lite 340(Nearly new looking)
1998 Polaris Touring 500
1998 Club Car (electric)