Input needed re new power washer

I doubt it. And stucco can be easily screwed up. Probably for $200 you could have it done by an experienced pro who won't do damage. But get someone good.

First determine what kind of stucco you have and what condition it is in. You can easily damage stucco with any power washer.

Second I would recommend renting the proper washer in the ideal size for the job. Harbor freight stuff can be useful, but it is not usually of very good quality. Renting a really good unit is going to make that part of your prep much easier.

Note: My comments are based on the assumption that power washing of any stucco is a good idea. I do know it is not recommended for some stuccos.