Paving clean - Mortar on paving

[southbey]

I have recently had a garage built, the block paving was already in place! The brickie was good but extremely messy! Consequently now he has completed I have a block paved drive with mortar stains everywhere. I have jetwashed the drive a couple of times and lots of the mortar has lifted off, but there are areas where the mortar remains and the drive surface even after jetwashing, dries dull and dusty.
Any ideas as to how and with what to clean the drive, I understand acid can cause discolouration.
Any advice appreciated

[sul]

acid well be ok,water it down and test on couple of blocks

[Tony McC]

I've never met a brickie yet that could keep a site clean - here's a tip: never sit next to them when they're eating!

I'd be wary about using acid: it can drastically alter the colouring of the blocks, but it may be the case that there's no alternatiove other than replacing the worst affected blocks.