Brushed aluminum is a wonderful material for outdoor garden furniture. It's wildly used because of it's modern feel, and stainless steel effect but with lighter weight & inexpensive features.
Brushed aluminum is long-lasting, durable material that requires very little care on the part of the owner. It will withstand most climates, and it's a lot stronger than you might think. It is a good outdoor material for dining chairs because dining chairs must be moved in and out during seating. It has no fear of being scratched during the moving.
To clean brushed aluminum, you can spray a multi-purpose cleaner on the surface and wipe it off with a dry towel. To shine your brushed aluminum and protect the finish, use a metal polish.