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Old but interesting thread. I believe the whitish look you have is due to a couple of things that likely happened while the installer was sealing your patio.
1. Your patio must be properly acid washed and left to dry for approx. 2 days. If the entire process was done in one afternoon then the brick was likely damp when the sealer was applied. That whitish look now becomes a permanent feature to your patio.
2. If it was acid washed first then left to dry for 48hrs and you still have the white stains, likely the patio surface was too hot to seal. Again permanent feature. It could take many years to wear off then you could attempt it again but likely your best bet is to either replace the brick or just leave it alone and live with the stains.
My company no longer offers this service since it is too hard to plan.
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