
Taking a soft top convertible through an automatic car wash is generally not recommended and can lead to costly damage. The high-pressure jets, harsh chemical cleaners, and abrasive spinning brushes found in many tunnel-style car washes are the primary culprits. The soft top's material, whether cloth or vinyl, is simply not designed to withstand that kind of aggressive treatment. For the long-term health of your convertible's roof, hand washing is the unequivocally safer choice.
The risks are twofold. First, the physical abrasion from brushes can cause premature wear, fading, and even small tears in the fabric or vinyl. Second, high-pressure water can easily force its way past the seals around the windows and roof, leading to interior water leaks. This moisture can damage electronics, promote mold growth, and cause unpleasant odors.
If you absolutely must use an automated service, your only viable option is a "touchless" or "brushless" car wash. These systems use only high-pressure water and detergents, eliminating the risk of abrasive damage. However, even touchless washes use strong chemicals that may degrade the waterproof coating on your soft top over time. Always check the manufacturer's manual for specific care instructions.
For optimal care, here’s a simple manual washing routine:
| Potential Risk | Consequence | Safer Alternative |
|---|---|---|
| Abrasive Spinning Brushes | Fraying, fading, scratches on material | Hand wash with soft mitt |
| High-Pressure Water Jets | Forced water leaks past seals | Touchless automatic wash |
| Harsh Chemical Cleaners | Degradation of waterproof coatings | pH-neutral, convertible-specific cleaners |
| Improper Drying | Mold, mildew, and water spots | Air dry or soft towel pat dry |
| Lack of Waterproofing | Loss of weather resistance | Annual application of fabric protector |

I never, ever take my Miata through a regular car wash. Those big spinning brushes are like sandpaper on the canvas roof. I stick to hand washing with a bucket and a soft mitt. It’s a bit more work, but it keeps the top looking new and, more importantly, prevents any chance of a leaky interior after a wash. A quick spray with a protectant afterward keeps the water beading off.

Consulting my owner's manual was the best move. It explicitly said to avoid automatic car washes with brushes. The recommendation was clear: hand wash only. I now use a two-bucket method and a cleaner made specifically for convertible tops. It’s a peaceful Saturday morning ritual, and I have the peace of mind that I’m not accidentally voiding any part of my warranty or causing unseen damage.


