Ronnie
We have just cleaned 3.5 sides of a supermarket, took 37 man days. Cleaned by hand.
It was aluminium - powder coated.
Autosmart G101
The client and myself were gobsmacked at the end result. It looked like new cladding.
Simply spray on, brush with handheld brushes and rinse off, before it dries.
Grab 5 litres from somewhere and give it a go - completely amazing.
I have the photos of Archer road on my website
Rob