Just as an update for future reference...I removed all the scale insects I could see with a tweezer. They come off very easy. If you have scales and try to remove them, you might see a foggy patina on the insect. It is a membrane they use to protect themselves from water suffocation.
I then sprayed the plant with a water/organic dish soap solution in a 4/1 ratio. Then, after 2 hours, I washed the maple with regular water (I gave 5 washes every 10 min).
I'll keep you guys updated