UPDATE: GOOD NEWS
I went back over to see the driveway today to take pictures of the spots and talk with the owner. Much to my relief I found out that the spots were already there! It wasn't caused by anything I did or didn't do.
As I began to explain to the owner that somehow I managed to screw up his driveway, and apologized about how badly the white spots looked. He began to laugh and told me that he had forgotten to tell me about those spots. He informed me that they have been there for over a year, but since the driveway has gotten dirty they didn't standout very bad before I cleaned it, and said that my work looked great, which makes the spots really stand out.
He advised me that the bright white spots were caused by a product that his kids had been using to clean their tires & rims. He thought it was some type of wax or something. When I looked at the spots it appears to me that the concrete has been extremely whitened, possibly by some type of acid based product and not a wax as he suggested. He wanted me to see if I can figure out how to remove the spots.
So here is my new question to anyone with any advise:
1. What do you think happened to cause those spots?
2. Do you think the spots can be removed or will he just have to live with a spotted driveway?
3. And if you think they can be what method would you suggest?
I have attach some picture of the driveway, both before and after. If you look closely at the before pics you can see the spots are already there. I also included a couple pics of the spots.
Thank God I took before pics and was able to see that the spots were indeed already there prior to my cleaning the driveway!
Please give me your opinion on this matter,
Randy A. Crandall
Skyline Exterior Cleaning
Hamptonroads, Virginia