Pressure Washing SOP & Safety Checklist

Why a standard beats a good memory

A process removes the owner

When the job lives in your head, the business cannot run without you. A written SOP moves the quality out of your memory and onto a card any tech can follow. That is the difference between a job you own and a job that owns you. Standardized work also trains faster, so a new hire is billable in days.

Safety is a system

Reminders fail under pressure. A checklist does not. The same steps that keep a crew safe around sodium hypochlorite and ladders also protect the customer’s plants, paint, and windows. Fewer callbacks, fewer damage claims, and a paper trail when a dispute lands on your desk.

The soft-wash job SOP

Four phases, arrival through QA. Adjust the mix ratios and pressure to your equipment and the surface in front of you.

Arrival and walkthrough

Match the paperwork. Confirm the address, scope, and quoted price against the work order before anything comes off the truck.
Locate water and power. Find the outdoor spigot, test the pressure, and note where the GFCI outlets are before you run a cord.
Walk it with the customer. Photograph pre-existing damage: oxidized paint, cracked or open windows, loose trim, failing caulk, dead plants.
Confirm scope out loud. Name anything you will not clean and get a verbal sign-off on any change before you start.
Identify every surface. House siding, roof, concrete, and wood each take a different mix and a different pressure. Plan the job by surface, not by square foot.

Pre-wet and protect

Close the house up. Windows and doors shut. Move or cover patio furniture, grills, cushions, and anything electronic in the spray zone.
Soak the landscaping. Pre-wet every plant, shrub, and stretch of lawn near the work, then keep them wet the whole time you spray.
Bag the fixtures. Tarp or bag light fixtures, exterior outlets, and low-voltage landscape lighting before mix goes up.
Mask what is delicate. Cover freshly painted trim and any surface the mix should not touch.
Stage your lines. Route hoses so a charged line never drags across a garden bed or a customer walkway.

Mix, apply, dwell, rinse

Mix to the ratio. Blend to the ratio on the work order for that surface and that level of growth. A house wash runs a diluted sodium hypochlorite blend with surfactant. Verify the ratio, do not guess it.
Apply low, work up. Start at the bottom and move up. Applying bottom to top prevents streaking on a dry surface.
Let it dwell wet. Give the mix time to work, but never let it dry on the surface. Re-apply if it flashes off in sun or wind.
Read the surface. Watch the green and black organic growth lift and clear. That is your signal to rinse, not the clock alone.
Rinse top down. Rinse from the top so dirt carries down and away from clean surface. Then rinse the plants and hardscape around the zone one more time.

Post-job QA

Walk it again. Look at the surface wet, and where you can, look again after it dries. Check for missed spots, streaks, and overspray on windows and cars.
Protect the runoff zone. Re-rinse any plant that saw runoff and confirm there is no pooled product on driveways or patios.
Photograph the result. Shoot the finished work in the same frames as the before photos. Matched pairs settle disputes and sell the next job.
Close the loop. Get customer sign-off, collect payment, leave a card, and ask for the review while you are standing in the clean result.
Log the job. Record the mix ratios, dwell time, and photos before you pull away. See the record-keeping section below.

Safety checklist

Print this, run it before and during every job, and hold the crew to it. The sodium hypochlorite group is the one nobody skips.

PPE on every crew member

Chemical-splash goggles or a face shield when mixing or spraying overhead.
Nitrile gloves rated for the chemicals you carry.
Long sleeves, long pants, and closed rubber boots.
A brimmed hat or hood for overhead soft-wash work.
A change of clothes and clean water on the truck for rinsing skin and eyes.

Sodium hypochlorite (SH) handling

Never mix SH with acids, ammonia, or any acidic cleaner. Mixing can release toxic chlorine gas.
Keep containers labeled. Never store SH in a sealed, unvented drum in the sun.
Keep an eye-wash bottle and fresh water within reach whenever you mix or spray.
Ventilate. Do not spray SH in an enclosed space without airflow.
Treat the concentrate with respect. Dilute or downstream before it reaches skin, plants, or lungs.

Ladder and roof safety

Soft-wash the roof from the ground or a stable ladder where you can. Walking a wet roof is a fall and a slip risk.
Set ladders on firm, level ground at the right angle, with a second crew member to foot them.
Never carry a charged hose up a ladder. Run the line up separately or reach from a pole.
Keep three points of contact. Move the ladder instead of overreaching.

Electrical and GFCI

Plug every corded tool into a GFCI outlet or a GFCI-protected cord.
Keep connections up off wet ground and out of standing water.
Bag or tape exterior outlets and fixtures before you wash near them.
Inspect cords for cuts or exposed wire before each job.

Downstream and surface-cleaner basics

A downstream injector pulls mix from a jug through the low-pressure side, so the surface sees a pre-diluted blend, not raw concentrate.
Match the nozzle to the injector so you actually draw chemical.
Use a surface cleaner for flatwork like driveways and patios. It gives an even clean and avoids wand streaks (zebra striping).
Keep tips and the surface cleaner clear of debris so pressure stays even.

SDS and record-keeping

The part that protects you after the truck is back in the shop.

Carry the SDS. Keep the current Safety Data Sheet for every chemical on the truck, in the cab or a labeled binder.
Log every job. Address, surfaces cleaned, mix ratios, dwell time, and matched before-and-after photos.
Keep an incident log. Record any spill, splash, plant damage, or near miss, and what you did about it.
File the paperwork. Keep insurance certificates and any required licenses with the job records.
Review monthly. Patterns in damage claims or near misses tell you exactly where the SOP needs a fix.

Crew job card

A one-page card the crew runs on every job. Copy it into your notes, a work order, or a print sheet.

Soft-wash job card

Job / address: __________________Date: ____________ Crew: ____________

Before you unload

Work order matches address, scope, price
Water and power located, GFCI confirmed
Walkthrough done, pre-existing damage photographed
Scope confirmed out loud with customer

Protect

Windows and doors closed
Furniture, grills, electronics moved or covered
Plants and lawn pre-wet and kept wet
Fixtures and outlets bagged

PPE on

Goggles or face shield
Chemical gloves
Sleeves, pants, rubber boots
Eye-wash and fresh water on the truck

Mix and apply

Mix ratio verified for the surface
Applied low to high
Dwell kept wet, not dried
Growth cleared before rinse
Rinsed top down

After

Plants re-rinsed, no pooled product
Windows and cars checked for overspray
Finished work photographed
Customer sign-off collected
Payment collected, review requested
Job logged: mix, dwell, photos

Safety reminders

Never mix SH with acids or ammonia.
Never carry a charged hose up a ladder.
The SDS for every chemical rides in the truck.

Questions operators ask

Why does a pressure washing business need a written SOP?

A written standard operating procedure is what lets the job run the same way on every truck, whether you are on site or not. It cuts the mistakes that cost you money: overspray on a car, a burned plant bed, a streaked house that needs a re-do. It shortens training, so a new tech is productive in days instead of weeks. And it protects you when a customer disputes the work, because the SOP plus your job photos and logs show exactly what was done. The owner who wants to grow past a single crew needs the process written down, not carried around in their head.

What PPE does a soft-wash technician need?

At a minimum: chemical-splash goggles or a face shield when mixing or spraying overhead, nitrile gloves rated for the chemicals you carry, long sleeves, long pants, and closed rubber boots. Overhead work adds a brimmed hat or hood so mix does not run down your face. Every truck should carry clean water and a change of clothes for rinsing skin and eyes. This is general guidance. Check the SDS for each product you use and follow its specific personal protective equipment requirements, which can call for more.

Can you mix sodium hypochlorite with other cleaners?

No. Never mix sodium hypochlorite (the SH in a soft-wash mix) with acids, ammonia, or any acidic cleaner. The reaction can release toxic chlorine gas, which is a serious health hazard in the open air and far worse in an enclosed space. Soft-wash mixes are SH, water, and a surfactant, blended to the ratio for the surface. Keep acidic products like some rust removers and brighteners stored and used separately, and always read the SDS before combining anything. When in doubt, do not mix.

What records should a pressure washing business keep?

Keep the current Safety Data Sheet for every chemical on the truck. For each job, log the address, the surfaces cleaned, the mix ratios, the dwell time, and matched before-and-after photos. Keep a simple incident log for any spill, splash, plant damage, or near miss, along with what you did about it. Keep insurance certificates and any required licenses with the records. Review the whole set monthly, because patterns in damage claims or near misses point straight at the part of your process that needs a fix.

Built by the team behind

Pepper’s Pressure Washing’s marketing

We build the websites, local SEO, and lead tracking that turn a pressure washing route into booked jobs. The same discipline that standardizes a job standardizes the office: our lead tracking guide does for your marketing what this SOP does for the truck. See how we run the pressure washing marketing system, or read the Pepper’s case study.

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