Malaysia 1998 $100 Harrison & Son

***A stack of 100 consecutive pieces of the $100 banknote printed by Harrison & Son & which should be in UNC condition but unfortunately, due to the toll of these past 20 years or so, these banknotes are already 65% to 66% foxing, or rather they are suffering from tropicalisation or are rather ageing or whatever.
If there is a problem, there's always a solution, so to speak, for maybe, Sir Raymond Chang can lend a helping hand in getting all these ugly brown stains removed.
It's a very secretly & jealously guarded knowhow which Sir Raymond will never divulge but of course, his learned Lordship wouldn't mind helping an old ageing friend in tackling this common problem of numismatic tropicalisation.