Pressure washing concrete

Sipdawg

New member
Just started pressure washing as a side gig but would like for it to one day become a full time opportunity. I pressure washed this concrete driveway today. Once I finished the job I noticed these random dark spots that were on the concrete. The driveway was completely dry. The concrete is 20 years old. Was this an error on my part or just the aging from the concrete over the years?? Thanks in advance. Here are some after pics
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astikadist

New member
It looks pretty good for a 20-year-old concrete, to be honest. I had a similar issue with our previous driveway. No matter how much I washed it and what solutions I tried, it still wasn't perfectly clean, and the cracks were all black. The only solution I found was calling commercial concrete contractors Denver CO, and asking them to rebuild it. It might have been an impulsive decision, but I didn't regret it for a second. It's an absolute pleasure seeing that perfect driveway every morning.
 
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