wipe off cement spots

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wipe off cement spots

wipe off cement spots Description

Dear Sir,
 
We had sand (http://maplered.com) Stone (http://g603.net) from India put down on our concrete patio. Unfortunately the guy who put the Stone (http://g603.net) s down did a messy job and (http://maplered.com) did not wipe off cement spots. Even the dark mortar/grout is smeared all over the Stone (http://g603.net) s. How can we safely clean the surface without damaging the Stone (http://g603.net) s?  The job was done about 1 week ago. Please advise.
Thank you in advance.
 
Annemarie Matthews