For car wash and detailing
Fill every bay without losing a full-day detail to a no-show
SiniSlot lets a Malaysian car wash or detailing shop take bookings through WhatsApp or a booking link. It shows only times a bay is genuinely free, holds the bay for the length the job actually takes, can ask customers to pay upfront with FPX online banking, and records every job with its payment state. Customers book without installing an app.
Built for Malaysian workshops · FPX online banking payments · Customers need no new app
By Zukmi Hazamer, founder of SiniSlot Booking · Last reviewed 2026-09-05
Why a detailing bay ends up empty
A quick wash and a full paint correction are not the same booking, but a WhatsApp thread treats them identically. That is where the day breaks down.
- A customer books "detailing" with no indication whether it is two hours or a full day, so the bay is planned wrong.
- Two cars arrive for the same slot because the schedule lives across several chats and nobody reconciled them.
- A full-day coating job cancels the night before, the bay sits idle, and there is no time to resell it.
- A sedan and a 4x4 are quoted the same price by mistake, and the disagreement happens after the work is done.
- Walk-ins are turned away for a booking that never arrives, so you lose the job you already had.
What one empty bay-day costs
Detailing loses money differently to a quick wash: the loss is measured in bay hours, not in one missed haircut. Fill in your own figures.
| Full detail price | RM350 |
|---|---|
| Bay hours that job occupies | 6 hours |
| Full-day no-shows per month | 2 |
| Lost revenue per month | RM700 |
| Paid upfront when the customer books | RM350 per booking |
This is a worked example with the inputs shown, not a measured result and not a claim about what SiniSlot will achieve for your shop.
How a booking runs
One continuous journey, from the customer’s first message to a bay reserved for the right length of time.
- 01
Customer messages the shop
They tap your link or send a WhatsApp message. No app to install, no account to create.
- 02
They choose the service and vehicle
A wash, a wax, a coating, or a full detail. Set a separate service per vehicle size so a 4x4 is never priced as a sedan.
- 03
SiniSlot checks bay availability
Each service carries its own duration, so a six-hour detail blocks six hours of bay time rather than a single slot.
- 04
They pick a time
Only genuinely free bay time is offered, so two cars can never be booked into the same bay.
- 05
Payment is taken, if you turn it on
Optional, and most useful on long jobs. Customers pay the full price with FPX online banking and SiniSlot pays it into your bank account.
- 06
The bay is reserved
SiniSlot waits for the payment provider to confirm before treating the booking as paid, so a failed payment never holds a bay hostage.
- 07
Everyone has a record
The job appears in your schedule with the vehicle and service. The customer gets a private receipt and a reminder before the appointment.
What it looks like
Real screens from SiniSlot, taken in the sandbox anyone can try at sinislotbooking.com/sandbox. The sandbox runs a sample business, so the names, prices and bookings below are sample data.
What matters in a wash or detailing shop
These are the parts that decide whether the schedule survives a busy weekend.
Duration per service
A express wash and a paint correction occupy very different amounts of bay time. Each service carries its own length.
Pricing by vehicle size
List sedan, MPV, and 4x4 as separate services with their own prices and durations, so the quote is settled before the car arrives.
Multiple bays
Set how many jobs can run at once so the schedule matches the number of bays and hands you actually have.
Payment upfront on long jobs
Ask customers to pay when they book, so a full-day detail is secured. A full-day job is the one you cannot afford to lose.
Staff accounts
Whoever is on the counter can manage the day without reaching your payment settings.
Reminders before the slot
A WhatsApp reminder goes out before the appointment. Customers consent during booking; it is not marketing.
A price list customers can read
A public page with your packages, prices by vehicle size, photos and common questions, so you stop re-quoting the same job.
Cancellation that is recorded
A paid booking cannot be quietly cancelled. The owner refunds it from the balance or gives a reason, and the customer is told.
Setting up, realistically
Four things before a customer can book. Most shops finish in under twenty minutes.
- 01Claim your booking link, for example sinislotbooking.com/b/your-shop.
- 02Add each package as a service, with its real price and how long it occupies a bay.
- 03If price depends on vehicle size, list the sizes as separate services.
- 04Set your opening hours and how many bays can run at once.
- 05Preview the page as a customer, then send yourself a test booking before sharing it.
- 06Turn on online payment later, only when you want customers to pay upfront.
What SiniSlot costs
SiniSlot is free to use, with every feature. You only pay when a customer pays you online, and when you take the money out.
Bookings, reminders, staff accounts, E-Invoice tools
RM0, unlimited
A RM350 full detail paid by online banking
RM1.75 (SiniSlot RM0.50 + Billplz RM1.25); RM348.25 goes to your balance
Paid by card instead, if you turn cards on
RM6.80 (SiniSlot RM0.50 + Billplz 1.8%, RM6.30); RM343.20 goes to your balance
Each payout to your bank
RM1.75 (SiniSlot RM0.50 + Billplz RM1.25), however many bookings it covers
Walk-ins and pay-at-counter bookings
RM0
Billplz sets its own fee and may change it. Payments always shows the current amounts.
See every feeQuestions wash and detailing shops ask
Can I charge different prices for a sedan and a 4x4?
Yes. List each vehicle size as its own service with its own price and duration. The customer picks the one that matches their car, so the price and the bay time are both correct before they arrive.
How do I stop a six-hour detail being booked as a one-hour slot?
Each service carries its own duration. When a customer chooses a six-hour detail, SiniSlot blocks six hours of bay time and will not offer an overlapping slot to anyone else.
Can I run more than one bay at the same time?
Yes. You set how many jobs can run concurrently, so the schedule reflects the number of bays and staff actually working.
Do I have to take payment upfront?
No. Online payment is optional. When it is on, customers pay the full price when they book, which protects a full-day detail where a no-show is expensive.
Who holds the money when a customer pays online?
SiniSlot collects the payment through Billplz on your behalf and pays it into your bank account once the payment is verified. You add and manage that bank account in Payments.
What about walk-ins?
Bookings and walk-ins can coexist. The schedule shows which bay time is already committed, so you can see at a glance whether a walk-in fits before you accept it.
Is a booking receipt the same as an LHDN E-Invoice?
No. A booking receipt confirms the customer paid. An LHDN E-Invoice is a separate tax document submitted through MyInvois. SiniSlot provides tooling to support that submission, but your business remains the taxpayer responsible for it.
Can I try it before signing up?
Yes. The sandbox opens a temporary account with sample bookings so you can use the real dashboard and the WhatsApp booking journey. It is deleted when you leave, and no card is involved.
Start free
Every feature from day one, no card required. Turn on online payment only when the shop actually needs it.