Update:
Success with cleaning the mould off the 60mm Guide scope lens.
It unscrewed at the front of the scope and I got easy access to the lens – happy days.
I used Baader Optical Wonder cleaning fluid and some PEC pads wipes
i.e.
https://www.baader-planetarium.com/en/optical-wonder-cleaning-fluid.html
https://www.amazon.co.uk/Photographic-Solutions-10x10cm-Pec-Pack/dp/B0001M6K24
Now I need to be brave and tackle my 8” EdgeHD……. Need to watch the YouTube videos again first…..