In all honesty mate its a crap picture. You cant really make out the work that needs doing. Is that whole side sectioned into pieces approximately 4' x 2' or is that barwork something else, thus making the glass sections bigger and easier to clean? Will all that junk be gone when they want you to clean it? Or will you spend the day hopping over tools and dodging scaffolding?
If theyre all separate pieces of glass I can count over 160 in that pic alone. Insides trad, at height, builders clean, can you use that scaffold in the pic?