A car being washed with a hose outdoors. Water sprays create a cleaning effect on the vehicle.

Rated 4.8 by 3,412 Valley drivers

Underbody Flush

High-pressure oscillating jets clean the undercarriage, frame rails and wheel wells.

+$4add-on price (sample)

Dust and road grime blasted off

Desert dust, construction site mud and road film collect underneath where you never see it. Over time it traps moisture from monsoon puddles and holds heat around components.

Underbody Flush uses oscillating high-pressure jets built into the tunnel floor to rinse the undercarriage and wheel wells clean on every pass.

How it works

  1. Add at the kiosk

    Pair it with Express Rinse, it is already in Deluxe and up.

  2. Enter the tunnel

    Floor jets activate as your front tires reach the conveyor.

  3. Flush

    Jets sweep side to side across the undercarriage.

  4. Finish

    The rest of your wash continues as normal.

Why drivers choose Underbody Flush

After off-road trips

Clears red dirt from trails around Sedona and the Superstitions.

Protects parts

Less caked grime around suspension and brake lines.

Included in Deluxe+

Part of every package above Express Rinse.

Pricing and good to know

  • Adds $4 to Express Rinse
  • Recommended after construction zones and trails
  • Safe for lifted trucks and SUVs

Add-on

+$4

Added at the pay kiosk

Members

Included

Recommended after construction zones and trails

Sample pricing for this demo site.

What members say

4.8 out of 5from 3,412 Google reviews (sample)

I wash twice a week because of the dust and it costs less than two single washes. Line moves fast even on Saturdays.

Daniela RuizArcadia, Phoenix · Deluxe Unlimited

Water still beads on my hood two weeks later. The vacuums are strong and there is always an open stall.

Marcus BellChandler · Ceramic Max

Student rate plus the tag reader means I am in and out between classes. Staff actually wave you through with a smile.

Priya NatarajanTempe · Express Unlimited

Our 14 service vans run through Power Rd weekly. One invoice, no receipts to chase. Our techs love it.

Tom KowalczykMesa · Fleet account

Great shine and the Rain Guard made a real difference in the storm last week. Wish Bell Rd had interior service.

Aaliyah BrooksGlendale · Ultimate Glow

Ten minutes and my rideshare car smelled new again. Worth every dollar with the member discount.

Kenji WatanabeAhwatukee · Interior Express
Read all reviews

Underbody Flush FAQ

There is no road salt here, but dust and mud buildup still hold moisture and heat. A regular flush keeps things clean.

Yes. Undercarriage components on hybrids and EVs are sealed for road water exposure.

It removes most mud. For thick caked clay, pre-rinse at a self-serve bay first.

Make it shine like new

Unlimited washes from $19.99 a month at all 5 Valley tunnels. Free vacuums every visit, cancel online anytime.

Rotary polisher bringing up the gloss on a dark blue hood

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