suggestion to remove rust spots from slate patio

suggestion to remove rust spots from slate patio Images

suggestion to remove rust spots from slate patio

suggestion to remove rust spots from slate patio Description

Six weeks ago I had a slate patio installed.  I pressure washed it today in prepartion for sealing it but was not able to remove spots that have developed.  I think the color is California Gold.  It is predominately brown/rust with some greens.  The spots only developed where the slate is exposed to the sun.  The spots are rust in tone.  Any suggestions to remove them?  Muratic acid?

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