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I was wondering what worked too as I have the same problem. Did find this info:

"Acids will make a mess of asphalt so you want to stay away from them as a stain lifter ..."

https://cleaning.tips.net/T006569_Removing_Rust_Stains_from_Driveways.html
I seriously doubt that "acids will make a mess of asphalt." Asphalt is essentially like an oil or wax, which means that a base (or alkaline chemical) might attack it (like lye attacks fats/oils) but not an acid. That's why acid containers are often made out of plastic (which like asphalt is made from petroleum).
 
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