Buying a Mobile Detailing: Due Diligence Checklist & Red Flags (2026)

Red flag: One-time residential jobs account for over 70% of revenue with no fleet contracts or membership plans, making income unpredictable.

Ask: What percentage of your 2025 revenue came from recurring fleet accounts, one-time details, and add-on services like ceramic coating?

Red flag: Supplies cost more than 15% of job revenue, indicating either product waste, theft, or chronic underpricing.

Ask: Can you show the cost of chemicals, towels, and other consumables as a percentage of job revenue for the past 12 months?

Red flag: The seller runs personal vehicle fuel, insurance, and meals through the business, inflating SDE by 30% or more.

Ask: Walk me through every personal expense you currently run through the business that won't exist for a new owner.

Red flag: The generator, pressure washer, or water tank is beyond its useful life but depreciation hasn't been reserved for replacement, creating a hidden capital call.

Ask: What major equipment is near end-of-life, and do you have a replacement fund or quotes for new units?

Red flag: 30% or more of revenue is cash with no trail, making SDE unverifiable and overstating the business's real earning power for lending.

Ask: What exact tracking do you have for cash tips and under-the-table jobs, and can I reconcile bank deposits against your POS/app records for three sample months?

Red flag: The truck/van has over 200,000 miles, rust, or deferred maintenance with no log—repair bills will eat early profits.

Ask: Please provide the full vehicle service history for the past two years and the last DOT/commercial inspection report.

Red flag: The operator has no containment mat or evades local stormwater rules; fines start at $500 per incident.

Ask: How do you currently capture wastewater, and can I see your city/county mobile vending permit and any environmental inspection records?

Red flag: The business carries only personal auto insurance on a commercial rig or lacks garagekeepers liability, exposing you to catastrophic loss if a client's vehicle is damaged.

Ask: Show me your current commercial auto, general liability, and garagekeepers insurance declarations pages and any claims in the last three years.

Red flag: The business runs on the owner's personal cell phone and a paper notebook—no CRM, no automated reminders, no way to scale.

Ask: What software do you use for bookings, route planning, and client communication, and how transferable is that account to a new owner?

Red flag: Five-plus mobile detailers serve the same 10-mile radius with identical pricing and services, forcing a price war.

Ask: Map your five closest competitors and tell me what your detailers do that they don't—why do your customers choose you?

Red flag: A single dealership or rental fleet contributes 50% of revenue on a 30-day cancelable contract.

Ask: What is your largest client's share of total revenue, and how long have they been with you?

Red flag: The Google Business Profile shows a 3.5-star average with recent negative reviews mentioning damage or no-shows.

Ask: Can I see your review response rate and the trend in star rating over the last year on Google and Yelp?

Red flag: The seller spends $1,000/month on boosted Facebook posts but can't track how many jobs they generate—return on ad spend is unknown.

Ask: What is your cost per lead and cost per acquired customer for every channel you use, including repeat and referral rates?

Red flag: The business operates as a sole proprietorship with no formal entity, and city mobile vending permits are non-transferable by ordinance.

Ask: What legal entity do you use, and have you confirmed with the city that your mobile detailing permit can be reassigned to a new owner?

Red flag: Any past or pending EPA/local citation for illicit discharge into storm drains—the new owner inherits the liability and remediation orders.

Ask: Have you ever received a notice of violation, stop-work order, or fine related to water disposal, and can you provide all correspondence with environmental agencies?

Red flag: The detailing rig has a lien from a third party or is titled in a relative's name, blocking clear transfer.

Ask: Is the vehicle titled solely in the business's name, and are there any existing loans or liens on it?

Red flag: Detailers are treated as 1099 contractors but meet IRS employee criteria, exposing the buyer to back taxes and fines.

Ask: How are your detailers classified, and can I see your workers' compensation policy and last two quarters of payroll tax filings?

Red flag: The seller intends to announce the sale by email and walk away on day one with no on-site transition, causing client defection.

Ask: What is your plan for introducing me personally to the top 20 accounts, and will you work alongside me for at least 30 days post-close?

Red flag: Chemical and towel suppliers deliver on net-15 terms based on the seller's personal credit; a new owner must establish new terms.

Ask: Can you introduce me to your suppliers and share the current pricing, delivery schedule, and whether the buying entity can assume those terms?

Red flag: The business phone number is the seller's personal cell, and the domain is registered in their personal name with no transfer plan.

Ask: Who legally owns the business phone number, Google Business Profile, and domain, and what is the exact process to transfer them to me?

Red flag: No non-compete exists, and the seller's son-in-law is the lead detailer who may leave and poach clients.

Ask: What non-compete and non-solicit agreements are in place for you and any key employees, and will they sign new ones at closing?