Stuff like Bilberry Alloy Wheel Cleaner? It won't affect anything else really
I've been using it for a couple of years now. As long as you use it as directed on the instruction panel then it will be fine. I leave it on the wheels for a few minutes before blasting off with the pressure washer.
Speaking of pressure washers.... the Nilfisk 110 I got ages ago is still going strong. So strong in fact that a single second of it accidentally firing on my hand resulted in this:
Shudder to imagine 2 or 3 seconds :S

Speaking of pressure washers.... the Nilfisk 110 I got ages ago is still going strong. So strong in fact that a single second of it accidentally firing on my hand resulted in this:

Shudder to imagine 2 or 3 seconds :S