How do I remove chalk stains (washed down from poorly sealed siding) from brick?

Powerwash or if you don't have 1 and don't want to rent 1 - go to Home Depot (or like) and get this screw on attachment for your hose that shoots out a stream of water at a high pressure, usually loose in a bin (it's not packaged) but it works great... usually near where the sprinklers are located...How do I remove chalk stains (washed down from poorly sealed siding) from brick?
if it's just chalk then this should wash off easily with water and a good nylon scrubbing brush.

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