Questions: What's on them? (Is it general build up?)
Are they external or within the confines of the building (Castle)
Are water and power available within reasonable distance. 25 - 50mtrs.
Is there drainage, or will you be wet vacuuming?
Do you have rotary single disk scrubber?
If you can provide those answer then I would offer advice.
PS: Thought Camelot was myth!