Pressure Washing FAQs for Wilmington, Answered Honestly
Straight answers to the questions we hear most from homeowners around Wilmington, covering cost, safety, mold and algae, the cleaners we use, and when to call a pro. Do not see yours below? Reach out and just ask.
1910-408-7236
Pressure Washing Basics
Pressure washing uses high pressure water at normal temperature. Power washing is the same but with heated water, which cuts grease and grime faster. Soft washing uses low pressure and a cleaning solution to kill mold and algae without risking the surface. The right one depends on what is being cleaned.
Tipping is not expected, since pressure washing is a priced service, not a tipped one. If a crew does great work and you want to show it, $10 to $20 or a cold drink is always appreciated, but never required.
Spring and fall are the sweet spots here. Spring clears off the pine pollen, and fall washes away what hurricane season leaves behind. On our humid coast, though, mold and algae grow year round, so any mild, dry stretch works.
It can. Hot water is great for cutting grease off concrete, but it can warp or discolor vinyl siding and soften some sealants. The temperature gets matched to the surface, and most house washing is done with cool water and a cleaning solution.
About once a year for most homes, and twice for those near the water, where salt, humidity, and pine pollen grow mildew fast. If your siding looks dingy or your roof is streaking, it is already due.
Mold, Mildew, and Algae: Wilmington’s Health and Slip Hazards
Because it is alive, not just dirt. A quick rinse or a pressure blast knocks the surface layer off but leaves the roots down in the pores, so it grows right back within weeks. A soft wash with a cleaning solution kills it at the root, which is why it stays gone far longer in our damp coastal climate.
Keep it clean and keep it dry. A regular soft wash kills the growth at the root, and trimming back overhanging branches lets in the sun and airflow that algae hates. Fixing poor drainage and aiming sprinklers away from the walls helps too. On the coast, plan to stay on top of it.
Inside a house, nothing kills mold for good unless you fix what feeds it, which is moisture. Stop the leak or the damp, then clean or replace the affected material. On the outside, a soft wash kills the mold and algae on siding and roofs at the root. Keep in mind that indoor mold is a different job from the exterior cleaning we do.
Yes. Mold and mildew release spores that can trigger sneezing, congestion, and itchy eyes, and worsen asthma for sensitive people. Keeping the mold and algae off your siding, deck, and walkways cuts down the spores right around your home.
Yes. A slick, algae covered walkway is a real slip and fall risk, especially when wet and especially for kids and older adults. Cleaning off that green or black film brings back the traction and takes the hazard away.
Yes, and soon. If you slipped, the surface likely has a slick film of algae or mildew that turns dangerous when wet. A proper cleaning strips that layer and brings back the grip, so it does not happen again.
What Gets Pressure Washed, and the Risks
Not when it is done right. A proper house wash uses low pressure and a cleaning solution, which is safe for siding, trim, and windows. The risk comes from too much pressure, which can crack siding or force water behind it, and that is exactly why soft washing is the standard for homes.
Yes. High pressure can strip the protective granules off asphalt shingles and even lift or crack them, taking years off the roof. That is why roofs should be soft washed, with a cleaning solution and low pressure that kill the algae without harming the shingles.
The cream is the smooth top layer of cement paste on fresh concrete, and it stays soft until the slab fully cures, about a month. Pressure washing too soon strips that layer and leaves the surface rough, pitted, and weak. New concrete should cure before any pressure touches it.
The Cleaners and Chemicals
At the diluted strength used for soft washing, sodium hypochlorite does not harm sound concrete, and it kills driveway algae at the root. It can lighten colored or stamped concrete and burn plants, so it is applied at the right dilution and rinsed, with landscaping protected.
It depends on the job. Potassium hydroxide is the gentler and more soluble of the two, so it rinses cleaner and suits most exterior degreasing. Sodium hydroxide is stronger and better for heavy grease, but it is harsher on surfaces and plants. A pro picks the right one, at the right strength, for the surface.
No. Ten percent is a strong stock strength, and it gets diluted well down for soft washing. Even then it is not for every surface, since it can discolor colored concrete, corrode bare metal, and burn plants. The strength is matched to the surface, and delicate spots get protected or a different method.
DIY Related Questions
Light moss on a sturdy, ground level surface, you can handle with the right cleaner. But moss on a roof, or anything that needs a ladder, is best left to a pro, since high pressure ruins shingles and moss has to be killed at the root, not just scraped, or it comes back.
Yes, and worse than people expect. A pressure washer jet can cut skin deep enough for stitches, and injuries also come from ladder falls, kickback, and slips on wet surfaces. The same force that etches concrete will hurt you.
Between renting the machine, learning the settings, and working a big driveway or a two story house by hand, a job a pro finishes in a couple hours can eat a whole weekend. Without a surface cleaner and the right nozzles, it is slow going, and mistakes mean doing it twice.
For a small, sound patio, a careful job of your own is fine. For a house, a roof, a big driveway, or anything up a ladder, a pro brings the right pressure, tools, and cleaners, works faster and safer, and the cost of fixing damaged siding or concrete is far more than the cleaning.
Still Have a Question? Keep Reading Us Online
We keep guides and answers like these across our site for the Wilmington area, from house washing and roofs to decks, driveways, and gutters. If your question is not here, chances are one of our pages covers it, or you can call (910) 408-7236 and just ask.
Call Our Local Pressure Washing Expert Team
(910) 408-7236