Industries
Pressure washing for semiconductor and electronics plants
Entry walks, plazas and docks outside fabs and electronics plants kept clean and bright.
The outside of a building built around clean air
If you run facilities, operations or EHS at a semiconductor fab, an electronics assembly plant or a nanofabrication or university cleanroom building, Raincrest washes the exterior of your buildings: the main and employee entries, walks and plazas, parking and drive aisles, receiving docks and truck courts, building walls and the trash, recycling and pallet areas.
Inside, the facility’s cleanroom staff and written protocol run every step, from gowning to the wipe-down order. Outside, you need entries that look sharp for visitors and recruits, docks that stay clear of grime and walls that hold their color. That’s the part of the building we take care of.
Fabs and plants from the South Bay to Sacramento
Raincrest washes commercial properties across the South Bay, including Sunnyvale, Santa Clara and San Jose, and up through the East Bay to Sacramento.
Where the outside ends and the protocol begins
Cleanroom managers treat people as the main source of particles, so entry starts with shoe cleaning, tacky mats and gowning. Grit tracked in from a dirty walk or plaza is the first thing that routine has to stop.
The facility classifies and tests its own rooms, and exterior washing works outside all of that. Our job is a clean, dry approach to the building, finished before the first shift walks in.
What we wash outside a fab or electronics plant
| Area | What the crew washes | Settled with the facility first |
|---|---|---|
| Main and employee entries | Walks, plazas, steps, door surrounds, benches and gum near smoking areas | Shift start times and visitor tours |
| Parking and drive aisles | Stalls, aisles and oil spots, with a surface cleaner for an even finish | Which rows open on which night |
| Receiving docks and truck courts | Dock aprons, bumpers, dock doors and the walls around each bay | Delivery windows and staging zones |
| Building walls and screens | Tilt-up, metal panel and block walls, top down, at a pressure matched to the finish | Air intakes, louvers and equipment yards that stay dry |
| Trash, recycling and pallet areas | Pads, walls and gates | Hauler pickup days |
Docks follow the bay-by-bay approach in our guide to washing loading docks around receiving windows, and walls follow our building exterior washing method.
Air intakes and equipment that stay dry
A fab’s mechanical systems sit close to the walls we wash. Before the first visit, your facilities team walks the building with us and marks the air intakes, louvers, equipment yards and electrical rooms that must stay dry or off limits. Walls near them are washed in short runs, with spray aimed away, and the crew stays out of any area the facility has not opened.
Wash water and the industrial permit
In California, wash water from an industrial site is a permit question, and the facility owns the answer. The state’s Industrial General Permit prohibits discharges other than storm water unless that permit or another NPDES permit authorizes them. Its list of authorized non-storm water discharges includes items such as fire-system flushing, potable water and condensate, and washwater is not on it (as of November 2026).
The State Water Board lists manufacturers among the facility types typically required to obtain coverage, and whether a given plant is covered is the facility’s own matter. So your stormwater plan decides where rinse water may go. Our crew plans water use for each area, protects the nearby storm drain inlets before the first pass and works toward the areas your plan names. Our guide to keeping wash water out of storm drains explains the drain-protection steps.
Access, sign-in and timing
Fabs control who goes where on the grounds as tightly as inside. Crew names go to security ahead of each visit, and the crew follows the site’s sign-in, badge and escort rules and stages trucks and equipment where security directs. Entries and walks are often washed overnight or before dawn so they are dry by the first shift, while docks are done between deliveries. Our guide to getting ready for an overnight or early-morning wash covers the site team’s side.
Plants running several buildings on one campus can wash them on a rotation, and our business park page shows how a multi-building plan is laid out.
Request a plant washing quote
A walkthrough with your facilities and EHS contacts covers the entries, lots, docks, walls, dry zones and the windows that work, and ends in a written quote. Raincrest is insured and carries workers’ compensation, crews are background-checked, a supervisor inspects the finished areas and you get a certificate of insurance before the first visit. Campuses with similar rules are covered on our data center and power generation pages. Request a quote to schedule it.
A few useful answers
Common questions
Which parts of a fab does Raincrest wash?
The outside: entry walks, plazas, parking, docks, building walls and trash areas. Inside the building, your own protocol and cleanroom staff set every step.
How do you keep spray away from our air intakes?
Your facilities team marks the intakes, louvers and equipment yards that stay dry, and walls near them are washed in short runs aimed away.
Can our receiving docks be washed while deliveries continue?
Yes. Bays are washed one or two at a time around your delivery windows, with a lane kept open for trucks.
Who decides where the rinse water goes at our plant?
Your facility does, through its stormwater plan. Before any washing, our crew protects the storm drain inlets closest to the work.
Can entries be washed before the morning shift arrives?
Yes. Entries and walks are washed overnight or before dawn, so they are dry and clear when the first shift walks in.
Industries
Related industries
Services