What equipment would I need to wash the windows of a 6 story building?

I received request for quote today from a 6 story commercial building; I took the picture you see below from google earth.
He mentioned the building is antique and has hard water stains.
I am going to speak with the customer and see the building in person on monday.
What equipment would be required ? How would you all price a job like this?

If you dont know pass.

Can’t access all with wfp.

I assume you don’t do rope descent? If so pass

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That’d be a big tall lift job. Doable… At least the sides showing. Would you want to? That’s another question. Bit on the sketchy side. But Pricey, pricey…