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Thanks for all the input that I received recommending varous chemicals,
compounds, cleaners , etc. for cleaning vinyl. After trying a bunch this
weekend on my  _not so white_  vinyl top , I can report the following:
Simple Green, 409, liquid laundry detergent, Castrol's super cleaner ( or
whatever they call it ) ,various vinyl cleaners and most anything else I
tried got quite a bit of the dirt off, but didn't FULLY clean the top and
remove the 
( mildew ? ) smudge and stains. 
_The product that really made the difference was " X-14 Stain and Mildew
remover " bathroom cleaner._ Application of this stuff with a wet bristle
brush and not too much elbow grease got the top _ WHITE._ 
 Two notes though:
 ( #1 ) I probably wouldn't be tempted to use this stuff on a car whose
paint you really cared about ( just to be safe ) , or else I'd be REAL
careful.  ( #2) While this cleaner appeared to have no detrimental effect on
my top, YMMV.
As an aside, the use of X-14 made the cleaning task a little less
pleasant.....in the fact that the smell reminded me of performing  the task
for which this product was originally intended.  :~)
Most of the cleaners mentioned above ( particularly the Castrol ) worked
well on the interior, and I didn't have to resort to using X-14 there.
                                                                            
                                        Rick Fedorchak
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