So used this last week on my block paved driveway, when weather was dry, followed instructions poured in over the block whilst sweeping it in to the joints, removed any excess and watered down with hose.
Next day later the drive now has white patches that won't be removed
I believe the term is called Pollyhaze!
Let it weather a few weeks, will more than likely disappear. Many of these type of products leave a residue which sometimes looks like an oil slick when wet or greasy/hazy when dry.
Its been over a month now and the weathering hasn't helped the grey mortar residue, any products out there that would shiff it? Patio and block paved driveway has been affected by this.