Thank you for your input and concerns regarding the plastics.
Sorry for my overdue reply.
The idea,was to give the Lexmark E232 a complete service / clean as it was leaving white streaks where it was not printing, 'second hand'.
I contacted RS themselves, and they confirmed that this is Isopropyl.
I've then removed all the relevant rollers and blades, given them a good clean, emptied the waste bin and reassembled.
99% better printing now.
Darren.