While this is a normal and natural occurrence in all concrete products and in most cases will disappear over time there is a way to speed up the removal of those white spots.
How to remove salt stains from concrete pavers.
Cover the area with clean water to rinse.
When the pavers get wet these salt deposits gather on the surface resulting in a dull appearance.
Dip the broom into the water and use it to scrub the surface of the pavers.
Luckily efflorescence can usually be removed from pavers by dry brushing although you may need to apply a cleaner if the stains are really stubborn.
If any stains remain repeat the above steps.
Scrub for several minutes until the salt residue and stains start to lift.
If no wet vac is available you will need to use a mop or towels to remove the excess water.
The vinegar will have loosened and even removed some of the stain on its own but scrubbing will do the rest.
Allow the area to dry.
How to remove efflorescence from concrete pavers in 6 easy steps.
Brick concrete and virtually any patio surface may acquire calcium deposits from hard water which emits from many sprinklers and garden hoses.
Scrub for several minutes until the salt residue and stains start to lift.
Use the wet vac to remove the excess water.
Scrub again with the broom.
Dip the broom into the water and use it to scrub the surface of the concrete.
Spray the pavers with dish soap and water and then scrub away with a wire bristle brush to remove any remaining particles of dirt or stain.
Cover the area with clean water to rinse.