THE ANSWER IS YES, NO, MAYBE, ABSOLUTELY, POSITIVELY, NEVER, MAYBE, AND I
DON'T HAVE A CLUE.
There are MANY different variations of stucco, and if I could deduce your
particular type and problem, I would be working for the NSA at roughly $5
million a year.
Stucco is applied in stages.
Each stage's integrity depends on the stage before.
There are different stages, some being just sand, concrete, colorant, or
some binder, such as an acrylic or some adhesive outside the parameters of
sand, concrete, and whatever they throw in there.
Once you want to "clean" such stucco, it can come apart with the ease of a
fingernail pulling off one layer from another.
So, it is an equation that has variables.
If you have a loosely adhering level of stucco, you will find out really
quickly when you just blow a 3' x 3' hole in your stucco.
Easy is the best approach.
Scrubbing can take off flimsy surface coatings as fast as a power washer.
The trick is to find out what you're working with, then deal with that.
Don't go at it with a power washer, or you will quickly find out if you have
a soft vulnerable area or stucco.
Heart surgery pending?
Read up and prepare.