Slip exposure,
washed away.

Getting this wrong runs both directions. Too little pressure on a dock apron leaves grease behind. Too much on a building facade drives water past the weatherproofing or blasts mortar joints. The scope Nexara writes for a property names the surface, the method and the frequency before a crew shows up — floor care follows the same logic indoors on VCT, terrazzo and sealed concrete, and manufacturing and warehouse sites usually need both.

This is the detail a one-line quote tends to skip. The San Bernardino County MS4 permit (Order No. R8-2010-0036) lists “wash water from … steam and pressure cleaning” and “water from cleaning of … parking lots, streets, sidewalks, driveways, patios, plazas” among the discharges its cities must prohibit or control Santa Ana Regional Water Quality Control Board — Order R8-2010-0036. The county's own business guidance asks operators to cut runoff from parking lots and loading docks and to send floor-cleaning water to the sewer, not the parking lot San Bernardino County Stormwater Program. Published best-management practices for mobile power washing, such as Sonoma County's Streets to Creeks program, call for protecting storm drain inlets and collecting wash water with a portable wash pit or vacuum recovery unit Streets to Creeks — Mobile/Portable Power Washing BMPs.

• Grease, oil residue and degreasers from a dock apron are treated as pollutants, not just dirty water
• A vacuum recovery unit or portable berm keeps wash water out of the nearest inlet while a crew works
• Where the property allows it, contained water can be released to a landscaped area or sanitary cleanout instead of the street
• The containment method and the disposal point are named in the scope before the job, so the property knows where its wash water went

• Sidewalks, entryways and walkways — slip risk from grime and algae film
• Loading docks and dock aprons — grease, tire marks, cardboard residue
• Building exteriors, awnings and facades — atmospheric soiling, mildew streaking
• Parking lots and parking structures — oil staining, tire marks, general grime
• Graffiti and gum removal — localized, spot-treated rather than a full-surface wash

A single property often needs several of these on entirely different cycles — a dock apron every month, a facade once a year — which is why a one-line 'pressure washing' quote without a surface breakdown is usually a sign the scope hasn't actually been thought through.

Property managers rarely think about a walkway until someone falls on it. By then the question isn't whether it looked dirty — it's whether there's a record showing when it was last cleaned and on what schedule. That record is part of what a written scope gives a property: a defensible answer, not a guess.

This pairs directly with parking lot sweeping — sweeping keeps loose debris and grit off the surface between washes, so the pressure wash isn't re-fighting the same dirt every visit. Properties near Fontana and Rancho Cucamonga distribution corridors typically run the tightest dock-apron schedule because of continuous truck traffic.

• Distribution and logistics facilities — dock aprons, drive lanes, trailer staging
• Retail centers and restaurant pads — grease, gum, food debris at entries
• Property managers and HOA commercial areas — sidewalks, common-area facades
• Industrial and manufacturing sites — equipment yards, loading zones