Yes, my Mock Orange sometimes gets aphids. There's roses by mine, so they usually go on to attack those, but I do get damage every year on my mock orange "bush". I put this in quotes because the thing is humungous. I wish I knew what type it was...it was already here when I moved in. the thing is 12' high! I've never seen a mock orange this size...

A harsh water spray. Repeat as needed every several days.