Use this stuff......
You can get it from topoftheline.com
I have it and used it several times. WORKS WONDERS! It takes a few applications. Plastic razor blades are your friend.
When using it, make sure you put down plastic sheeting over your driveway, or you will leave white spots. Don't ask me how I know.
edit, I know you didn't want to order a product, but if she can wait, this product is well worth it.