splotchy mortar color

by Janice
(Greenville, SC)

We had a pennsylvania standing blue stone placed on our porch floor. The stone mason placed the stone and mortar and the floor looked great. They then cleaned the floor with a cleaner. After the cleaning, the mortar appeared to be flaking sand and the color of the mortar was lightened in some spots but not in others. The mortar now looks very porous and splotchy. Is there anyway to stain or correct the coloring of the mortar? What would you suggest be done?

Thanks