I've encountered something that looked almost exactly like this before and it was caused by brake pads getting so low that they got to metal on metal which threw little rusty bits all over the place.
The vehicle in question was fitted with painted alloy wheels with a metallic silver finish and a lacquer clear topcoat. I tried all ways to remove the rust ...
To remove iron oxide you can use vinegar,vinegar is acidic so it will disolve the oxide.
You need to be sure to rinse off the vinegar as it is corrosive to aluminium if it stay on for an extended time.
As others have said alloy wheel cleaner and some moderate elbow grease is the way to go - but you'll want to be careful with which cleaner, some cleaners are very harsh and looking at the pics there are places where the top lacquer of the alloy has been damaged and harsher cleaners risk further damage/corrosion. Avoid acid-based cleaners such as original ...
You need a dedicated alloy wheel cleaner. While almost any cleaner may remove some of the stain it may also damage the clear coat. Be sure to follow the instructions as most require the wheel to be cool and hosed off after application.
When this question was asked eight years ago, extensions, breaker bars and cheater pipes (risky if the pieces break) or using the starter (again, risky if pieces break or risky to the flywheel) were often used by DIYs who did not have an air compressor and an air impact.
Today, the battery powered high torque dewalt impact gun dcf 899 and the Lisle 77080 19 ...
I couldn't find this connector type, so I "sacrificed" the coolant adapter to build an adapter. Now I can either use the brake bleeder with this proprietary connector or use a standard (NW 7,2) connector.
I'll attach a cheap schrader valve to the coolant adapter, so it's still usable for me.