First show what was wrong with the supplied car and when you reported it. Then state what happened next: cleaning, an exchange, a second unsuitable vehicle, a cancelled rental, or continued use because no practical alternative was offered. Finally, identify the specific refund, credit, or correction requested.
The common dirty rental car problem
A renter reaches the vehicle and finds an unclean interior, smoke or another persistent odor, damp fabric, leftover food, or signs of pests. Sometimes the issue is obvious in the pickup bay. Sometimes it appears after dark, once the air conditioning runs, or after the car has been parked. The branch may exchange the vehicle, but that can mean another queue, a long drive back, lost rental time, or a replacement with a different condition problem.
It is reasonable to feel disgusted, worried about luggage, or frustrated that paid travel time was spent solving a fleet problem. Keep the complaint calm and reviewable. A replacement car does not automatically answer whether the first vehicle was suitable or whether a price adjustment was promised. At the same time, do not claim a medical risk or infestation that your records cannot establish. Describe exactly what you saw, smelled, photographed, reported, and were told.
What to do first
- Photograph or film the condition in context: the whole seat, footwell, boot, dashboard, or door area before close-ups.
- Record the vehicle number, registration, bay, pickup time, mileage, and when the problem first became apparent.
- Notify the branch or customer-service channel promptly in writing and save the case or roadside reference.
- Ask for safe, practical instructions: inspection, cleaning, exchange, collection, or permission to use another location.
- Save both the original and replacement agreements, any exchange slip, final invoice, and completed card entries.
- Write down the exact time lost and keep receipts for a necessary taxi, parking, fuel, or cleaning item you want considered.
If you are still at pickup and the condition is unacceptable, ask staff to note it before you leave. If you discover it later, report it rather than quietly returning the car and trying to reconstruct the conversation afterward. Avoid applying chemicals, setting off a pest treatment, or paying for major cleaning unless the rental company gives clear written instructions. Preserve the evidence and prioritize a safe exchange.
Build a condition-and-exchange timeline
- Pickup: vehicle identifier, time, bay, condition, lighting, and whether staff were present.
- Discovery: what you noticed, when, where the vehicle had been, and the first photos or video.
- Report: who you contacted, channel, time, case number, and the instructions or promise given.
- Handover: where and when the first car was released, its mileage and fuel, and who received it.
- Replacement: second vehicle and agreement, new pickup time, class, condition, and any price statement.
- Close-out: final invoice, card charge, promised adjustment, refund reference, and amount still disputed.
This timeline matters when several cars or departments are involved. It shows whether the first agreement closed at the handover, whether the replacement continued the same paid period, and whether an employee's promised free day or rate adjustment ever reached the final invoice.
Evidence to request from the rental company
- The vehicle preparation, cleaning, and release record completed before your pickup.
- The pickup record showing vehicle identity, mileage, fuel, bay, and release time.
- Branch, call, chat, and case notes recording your condition report and the response offered.
- Any inspection or cleaning record created when the first car was returned or collected.
- The exchange record linking the original and replacement vehicles and agreements.
- The final payment ledger showing holds, captures, credits, refunds, and any added cleaning, fuel, tyre, damage, or administration fee.
- For a promised adjustment, the approved amount, corrected invoice, processing date, destination payment method, and refund reference.
Ask the company to answer the remedy you actually requested. A full cancellation, one unused day, a price difference, reasonable documented extra costs, and a goodwill credit are not the same thing. List each amount separately rather than sending one large total with no calculation.
A calm first-response message
Subject: Disputed charge and adjustment request – rental [reference]
I dispute the unresolved amount on rental [reference]. At pickup on [date and time], vehicle [identifier] was supplied with [brief factual description of the interior condition]. I reported this at [time] through [branch, phone, or message channel] under case [reference], and followed the instruction to [return, exchange, or continue with the vehicle]. The first vehicle was handed over at [place and time], and [replacement vehicle/reference] was supplied at [time]. Please provide the vehicle preparation and release record, my condition-report notes, the first vehicle's return inspection, the exchange record linking both vehicles and agreements, and a payment ledger showing every charge, credit, and refund. Please also confirm the calculation and processing reference for the requested [unused rental time/price adjustment/documented expense]. I do not accept any separate fee that has not been evidenced and itemized. Please keep the amount disputed while these records are reviewed and respond to the specific timeline above.
What not to concede prematurely
Do not sign a replacement agreement as confirmation that the original condition was acceptable. Before signing, check whether the swap changes the rate, class, return location, fuel level, protection, or deposit. Do not agree that a later cleaning, tyre, or damage fee belongs to you merely because it appeared after the exchange; request the vehicle-specific inspection and calculation. Equally, do not describe every mark or insect as proof of a wider fleet problem. Keep your reply tied to the vehicle and records in your case.
If the bill now contains overlapping days or deposits across two agreements, use the vehicle exchange billing guide. If you returned the rental because it could not be driven safely, the breakdown refund guide is the better path for roadside records and unusable time. If the company instead charged you for how the car was returned, use the rental car cleaning fee guide to request the return inspection, alleged condition, work completed, and fee basis.
Follow up and prepare to escalate
A useful response should identify the first vehicle, acknowledge the reported condition, explain what the exchange or cleaning record shows, and address the requested adjustment. If the company only says that a replacement was provided, ask it to answer the remaining paid-time, extra-cost, or billing question. If it promises a refund, ask for the amount, currency, payment destination, date, and reference, then check that the credit actually posts.
Keep one folder with the booking, both agreements, original media, branch and customer-service messages, exchange paperwork, invoices, card entries, receipts, and a one-page timeline. Before escalating, separate what you can prove from what you reasonably want reviewed. That makes the central question easy to follow: what condition was supplied, how quickly was it reported, what remedy was offered, and what adjustment still has not been made?
Not My Scratch can help organize your booking, pickup photos or video, condition report, branch messages, original and replacement agreements, exchange record, invoice, receipts, card entries, and dates into a tailored response. It cannot guarantee a refund, but it can help you ask for a precise adjustment without turning a stressful experience into an unfocused complaint.