We are painters first, and this is the part of pressure washing painters care about most. Paint will not stick to dirt, mildew, pollen or chalky old paint. Roll a new coat over a wall like the right half of that brick and it will look fine for a season, then start lifting, taking the grime with it.
So an exterior paint job starts with a wash, then at least a full day of drying before any primer goes on. Brick and old mortar get handled with care: a wider fan, more distance and a cleaner that does some of the work, so the joints do not get blasted out.
Plenty of people call us for the washing alone, and that is fine too. A clean house, walkway and patio once a year keeps mildew from settling in, and when you do get around to painting, the prep is already half done.
We pressure wash across Murfreesboro and Rutherford County out of our shop here in town. The pressure washing page has the full list of what we clean.