Any Dryvit installed after 2000 should be okay as they implemented new techniques to allow the wall behind it to breathe. Pre 2000 saw lots of replacements being performed by contractors due to moisture getting trapped and causing mold and rot issues.
The above suggestions of low pressure and extreme caution are advised for ALL Dryvit. It is basically styrofoam with a skim coating of stucco on top to describe it in simple terms. An misstep with pressure will blow a hole in it faster than you can imagine. Soap tip, good chems and soft rinse. The front of my house is Dryvit and I just rinse with the garden hose.
Best of luck.