What washing removes
It clears dirt, mildew, salt, spider webs, and loose chalk that can block the paint bond.
Why more pressure is not always better
Hard pressure can cut screens, mark wood, and force water into cracks. The wall needs the right method, not the highest setting.
Dry time is part of the job
Stucco and block can hold water. Shade, rain, and humid air can slow the wait.
Washing is not full prep
Loose paint still needs scraping. Open gaps still need caulk. Stains and rust may need primer.
Check the wall after it dries
Some weak paint or cracks are easier to see after washing. The final prep list may change a little.
What to do next
Photograph mildew, chalk, screens, and wood parts so the wash method can be planned safely.