All reviews are from people who have redeemed deals with this merchant.
· Reviewed June 10, 2018
· Reviewed May 24, 2018
· Reviewed May 21, 2018
What You'll Get
Choose from Three Options
- $15 for three Ultimate car washes ($30 value)
- $19 for three Platinum car washes ($39 value)
- $22 for three Extreme Lava car washes ($45 value)
- Includes a free air freshener with every wash. Click to see everything that is included in each wash here.
Rain-X: Putting Drivers in the Clear
Rain-X doesn’t just make your car look better—it also makes you safer. Find out how with Groupon’s exploration of this water-repelling substance.
When rain beats down on a windshield, it can react one of two ways. It can splash indiscriminately across the glass, causing light to scatter and cloud the driver’s visibility. Or, if the glass is treated with a hydrophobic solution such as Rain-X, the random splashes can turn into cohesive beads that trickle quickly off the windshield and out of sight. This process seems straightforward, but the effects are actually quite dramatic—a 1997 study by the University of Michigan concluded that participants driving behind a hydrophobic-treated windshield had an increased reaction time averaging one additional second over drivers with untreated windshields.
Developed more than 40 years ago, the chemistry behind Rain-X draws largely on two familiar substances: ethanol and isopropanol, or rubbing alcohol. Several organic methyl and synthetic silicone molecule chains dissolve in the alcohols to sheath glass in a water-repellent layer. From the original windshield solution, Rain-X has expanded its water-beading technology into other products, including wiper blades and full-car waxes. Innovative users have called on Rain-X to repel moisture from the top sheets of skis to submarine antennae, an application discovered by Australia’s Department of Defense.
The Fine Print
Promotional value expires 120 days after purchase. Amount paid never expires. Limit 1 per person, may buy 1 additional as gift. Limit 1 per visit. Valid only for option purchased. May be repurchased every 180 days. So Cal Express Car Wash has a no-tipping policy, so gratuity is not needed. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.