The fear nobody names
"Will I pay for this and still be unhappy?" is a question that doesn't get asked out loud very often, but it's sitting behind a lot of the hesitation people have about booking a cleaning. Part of that is reasonable. Every company advertising this kind of work shows the same dramatic before and after photos, and it's easy to walk away assuming every job ends with a surface that looks brand new. Most of the time it does. Not always. Here's the honest version of where the line sits.
What a cleaning actually does
A soft wash or a pressure clean removes what's sitting on top of a surface: algae, mildew, dirt, organic buildup, the black streaking and green film that shows up on roofs, walls, pavers and pool cages across this whole area. That part works reliably. It's the entire reason the service exists.
What it doesn't do
It doesn't remove staining that has already soaked into the material itself, as opposed to sitting on the surface. Growth that's been left long enough can work its way into porous concrete or an aging paint surface, and at that point a cleaning lifts what's on top without pulling out what's underneath.
It doesn't repaint anything. If a wall's color has faded from sun and salt air, a cleaning takes the grime off a faded surface. It comes back clean, not new. Those look different, and it's worth knowing which one you're going to get.
And on rust-colored staining specifically, the honest answer is results vary. Some of it lifts right out. Some of it has been there long enough that it's genuinely just paint after that, not a cleaning problem anymore. That's not a hedge to avoid doing the work, it's the actual range of outcomes on that particular kind of stain.
Surface-by-surface, where the line usually falls
On a roof, the black streaking and green growth come off reliably. What doesn't change is a cracked or missing tile, worn shingle granules, or the general age of the roof. A cleaning makes an old roof look considerably better. It doesn't make it a newer roof, and it's worth knowing which of those you're expecting.
On concrete and pavers, the growth comes out of the surface and out of the joints. Oil that has soaked into concrete over a period of years is a different problem, and depending on how long it's been sitting there, it may lighten rather than disappear. Same with tire marks that have worked into the surface rather than sitting on it.
On painted or stucco walls, the mildew and dirt come off. If the paint underneath has already been damaged by mildew that sat there long enough to eat into it, cleaning reveals that damage rather than fixing it. That surprises people, because the surface looks worse for a moment before it looks better, but the damage was already there under the growth.
On pool cage screens, the grey film and buildup come off. A screen that's already torn, stretched or sagging is a repair, and cleaning doesn't change that either way.
Why almost nobody says this
Every competitor's content in this market is built to say yes. Yes it'll look brand new, yes every stain comes out, yes it'll be like a different house. Most of the time that's true, which is exactly why it's easy to promise. But "most of the time" isn't "always," and a company that never mentions the exceptions isn't being more capable than everyone else, it's just not telling you about them.
How to avoid being the exception
Send a photo before you book, especially if there's a stain that's been there a long time or looks different from ordinary black streaking. A straight answer about whether it's likely to come out fully, partially, or not much at all costs nothing and saves you from being surprised after the fact.
The one thing that changes the odds
Time. Almost everything on the "probably won't come out" list started as something that would have come out, and then sat long enough to work its way into the material. Growth on a wall is surface-level for a long while before it starts affecting the paint underneath. Staining on concrete is liftable before it's fully absorbed. The surfaces that disappoint people are usually the ones that went the longest without attention, which is also the argument for not letting it go another season once you've noticed it.
What this isn't
This isn't a list of excuses. Most jobs come out looking like the photos everyone shows. This is just the honest three or four exceptions, said plainly, so the ones that do apply don't feel like a bait and switch when you see the result.
Common questions
Will my driveway come out completely clean?
The growth and the dirt come out. Oil that's soaked in over years may lighten rather than disappear. A photo before you book gets you a straight read on which one you're dealing with.
Why does my wall look worse in spots after cleaning?
Because mildew that sat long enough can damage the paint underneath, and the growth was hiding it. The cleaning revealed the damage rather than causing it. At that point it's a paint question.
Can you get rust stains out?
Sometimes. Results vary on rust, and occasionally the honest answer is that it needs paint rather than cleaning. That's not a dodge, it's the actual range of outcomes.
Send a photo and get a straight answer
If you're not sure whether what you're looking at will come off, text a photo. You'll get an honest read on what a cleaning is likely to do for it, not just a yes.