ModWash vs Sud Stop Car Wash
Data updated · May 24, 2026
ModWash is larger (127 vs 16 locations); ModWash is rated higher (4.85★ vs 4.81★); ModWash has the lower reviewer-reported damage rate (0.83% vs 1.31%).
ModWash is a national-tier operator and Sud Stop Car Wash is regional-tier, so they're competing at different scale points. Customer ratings are essentially tied at 4.85★ vs 4.81★ — the gap is well within noise. On reviewer-reported damage, ModWash runs lower at 0.83% vs 1.31% — a narrow operating-quality gap. The dataset-wide average across all car wash chains is roughly 1–3%.
ModWash operates 127 locations across 12 states (10.6 sites per state on average). Sud Stop Car Wash operates 16 locations across 5 states (3.2 per state). ModWash has a denser per-state footprint (10.6 sites/state vs 3.2 for Sud Stop Car Wash), suggesting a more saturated regional strategy. Total customer signal is 182,068 Google reviews for ModWash (70,105 LLM-scored) vs 8,463 for Sud Stop Car Wash (5,730 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 | Sud Stop Car Wash | Winner |
|---|---|---|---|
| Wash Quality | +0.75 | +0.84 | Sud Stop Car Wash |
| Staff & Customer Service | +0.94 | +0.91 | ModWash |
| Wait Time | +0.64 | +0.74 | Sud Stop Car Wash |
| Per-Wash Price | +0.24 | +0.43 | Sud Stop Car Wash |
| Equipment Working | -0.33 | +0.20 | Sud Stop Car Wash |
| Facility Cleanliness | +0.79 | +0.90 | Sud Stop Car Wash |
| Membership Value | +0.25 | +0.36 | Sud Stop Car Wash |
ModWash's strongest aspect in customer reviews is Staff & Customer Service (+0.94); the weakest is Equipment Working (-0.33). Sud Stop Car Wash's strongest is Staff & Customer Service (+0.91); the weakest is Equipment Working (+0.20). Sud Stop Car Wash comes out ahead on Per-Wash Price, Equipment Working, Facility Cleanliness, Membership Value; ModWash doesn't have a clear win on any of the 7 pillars.
Sud Stop Car Wash has the lower cancellation-friction rate (9.1% vs 12.4% of mem-discussing reviews) — a meaningful gap. The dataset-wide rate is roughly 10–15%. Customers discuss memberships more often when reviewing Sud Stop Car Wash (12.9% of reviews) than the alternative (8.5%), which usually signals a more aggressively-marketed unlimited-wash program.
Do they operate the same format of car wash?
| Format | ModWash | Sud Stop Car Wash |
|---|---|---|
| Express Tunnel | 2.1% | 3.9% |
| Full Service | 3.6% | 1.5% |
| Self-Serve Bay | 0.6% | 2.2% |
| Hand Wash | 1.5% | 0.9% |
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.
Both chains are predominantly Express Tunnel operators, so they compete head-on for the same customer occasion. The choice between them is largely about brand, price point, location convenience, and customer experience rather than format differentiation.
Where do ModWash and Sud Stop Car Wash compete?
ModWash and Sud Stop Car Wash compete head-to-head in 4 metropolitan statistical areas. In those shared markets, customers can choose between the two. In short: 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 Sud Stop Car Wash
ModWash vs Sud Stop Car Wash: which is bigger?
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Which has the higher customer rating, ModWash or Sud Stop Car Wash?
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Which has the lower damage rate, ModWash or Sud Stop Car Wash?
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Where do ModWash and Sud Stop 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 / Sud Stop 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.