Concrete holds onto everything. Dirt, algae, tire marks, oil, rust from the sprinkler heads. We hot surface clean the whole slab at an even pressure so it comes out one uniform color, then we post treat the stains that pressure alone will not lift.
The people who quote your driveway are the people who clean it. No subcontracted crew showing up instead.
A specific number for your slab, in writing, that does not move once we are on site.
Pressure dialed to the surface so concrete gets cleaned, not etched. 5 stars on Google says the work holds up.
Tell us the address and roughly how much concrete you have. We will measure it up and put a fixed number in writing, for free.