




Not when done correctly. We use controlled pressure and angles that clean the stone without blowing out joint sand, and we can re-sand joints after washing if needed.
A typical double driveway takes 1 to 2 hours including pre-treatment. You can use it again as soon as it dries.
We pre-treat oil with degreaser before washing. Fresh stains usually come out fully; old, deep-set stains lighten significantly but may leave a shadow.
Once a year suits most GTA homes, ideally in spring once the salt and winter grime have settled. Driveways and high-traffic walkways may need it more often, while siding on a shaded, north-facing wall can collect algae faster and benefit from an extra wash.
They describe the same service. What matters is matching pressure and technique to the surface, which is exactly what you are paying a professional for.