ModWash vs Spark Car Wash
Data updated · May 24, 2026
ModWash is larger (127 vs 16 locations); ModWash is rated higher (4.85★ vs 4.75★); ModWash has the lower reviewer-reported damage rate (0.83% vs 1.77%).
Scale comparison crosses tiers — ModWash runs national-tier, Spark Car Wash runs regional-tier. ModWash edges ahead on review-weighted rating (4.85★ vs 4.75★, a narrow gap). On reviewer-reported damage, ModWash runs lower at 0.83% vs 1.77% — a modest operating-quality gap. The dataset-wide average across all car wash chains is roughly 1–3%.
| Metric | ModWash modwash.com | Spark Car Wash nxtwash.com |
|---|---|---|
| Locations | 127 12 states | 16 4 states |
| Reviews | 182,068 70,105 LLM-scored | 13,252 7,561 LLM-scored |
| Avg rating | 4.85 | 4.75 |
| Damage rate (lower better) | 0.83% | 1.77% |
| Membership cancellation friction (of mem-discussing reviews) | 12.4% | 11.1% |
| Dominant format | Express Tunnel | Express Tunnel |
ModWash operates 127 locations across 12 states (10.6 sites per state on average). Spark Car Wash runs 16 locations across 4 states, 4.0 per state. ModWash has a denser per-state footprint (10.6 sites/state vs 4.0 for Spark Car Wash), suggesting a more saturated regional strategy. Total customer signal is 182,068 Google reviews for ModWash (70,105 LLM-scored) vs 13,252 for Spark Car Wash (7,561 scored).
How do customers rate each chain on the 7 pillars?
Aspect scores aggregate WashIndex's LLM extractions across each chain's reviews. Each score is (positive − negative) / total mentions, ranging −1 to +1. Numbers above zero mean customers say more positive than negative things about the aspect; below zero means the reverse.
| Aspect | ModWash | Spark Car Wash | Winner |
|---|---|---|---|
| Wash Quality | +0.75 | +0.72 | ModWash |
| Staff & Customer Service | +0.94 | +0.90 | ModWash |
| Wait Time | +0.64 | +0.47 | ModWash |
| Per-Wash Price | +0.24 | +0.33 | Spark Car Wash |
| Equipment Working | -0.33 | +0.01 | Spark Car Wash |
| Facility Cleanliness | +0.79 | +0.92 | Spark Car Wash |
| Membership Value | +0.25 | +0.22 | ModWash |
ModWash's strongest aspect in customer reviews is Staff & Customer Service (+0.94); the weakest is Equipment Working (-0.33). Spark Car Wash's strongest is Facility Cleanliness (+0.92); the weakest is Equipment Working (+0.01). Head-to-head on the 7 pillars: ModWash wins on Wait Time, while Spark Car Wash wins on Equipment Working, Facility Cleanliness. The remaining pillars are too close to call.
Spark Car Wash has the lower cancellation-friction rate (11.1% vs 12.4% of mem-discussing reviews) — a modest gap. The dataset-wide rate is roughly 10–15%.
Do they operate the same format of car wash?
| Format | ModWash | Spark Car Wash |
|---|---|---|
| Express Tunnel | 2.1% | 4.1% |
| Full Service | 3.6% | 1.1% |
| Self-Serve Bay | 0.6% | 1.8% |
| Hand Wash | 1.5% | 0.4% |
Format share is computed across customer review mentions, not over locations. A chain with mostly express-tunnel sites but heavy detail-shop talk in reviews will show both at non-trivial rates.
Format-mix-wise, ModWash and Spark Car Wash are matched: both lean Express Tunnel. The differentiator isn't what they do, it's how they do it.
Where do ModWash and Spark Car Wash compete?
ModWash and Spark Car Wash compete head-to-head in 1 metropolitan statistical area. In short: If customer-rating consistency is the deciding factor, ModWash is the safer pick; if avoiding vehicle damage is the priority, ModWash runs the lower reviewer-reported damage rate; if location convenience matters most, ModWash has more sites to choose from.
About ModWash vs Spark Car Wash
ModWash vs Spark Car Wash: which is bigger?
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Which has the higher customer rating, ModWash or Spark Car Wash?
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Which has the lower damage rate, ModWash or Spark Car Wash?
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Where do ModWash and Spark Car Wash compete head-to-head?
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About this comparison
Both chains' numbers are pulled from the same WashIndex per-location dataset — Google reviews processed through LLM extraction across 55 dimensions, format classification from each operator's website, and competitive-density analysis. See each chain's full profile — ModWash / Spark Car Wash — for monthly trends, per-location drill-down, executive summary, and anomaly detection.
See our full methodology for the extraction pipeline, validation samples, and aggregation logic.