Chris
For first clean to move in you need to get at the glass & frames.
You,ll either use ladders, scaffold tower or platform. Either way you require access to all areas you must make sure they know & are willing to assist in moving vehicles & equipment if required. Add 1/2 a day on to cover any delays.
The frames will require cleaning, so after the first clean you can use extending poles so easy.
To drive platform you need ipaf licence & insurance.
To put up tower you need 2 men, & practice at using them.
Good luck
Gary