When I worked at LTU SuD after greasing it was mandatory to go around with a brush and clean off all excess grease as they didn't want loads of grease 'streaks' on the fuselage, gear, or flying controls as it made the a/c look a mess, unfortunately not everyine does this. Some of our a/c look a mess because of all the grease streaks, I guess it depends if you are doing it in house (more pride in the job and appearance) or if you are using a maintenance organisation to do it who don't really care that much.
You could always stipulate that this is unacceptable and make sure that they clean it off before it get backs to you.