dubmanu- Welcome to Autopia!
I agree with Dan, just doing a decontamination wash (i.e., ValuGard's ABC system) and using a good All-In-One oughta work wonders even if the paint is too thin to withstand serious correction.
Much as I like Autoglym Super Resin Polish (which I assume is available in your area), I do think you should use something with a bit more abrasive cut...something like HD's Speed or Zaino All-In-One.