# What Happens During an Aircond Chemical Wash | Shah Alam

> A step-by-step walkthrough of an aircond chemical wash -- dismantle, coil wash, drainage flush, gas top-up -- plus how long it takes.

URL: https://aircondserviceshahalam.my/guide/what-happens-during-chemical-wash/
Last-Modified: 2026-05-21

![Technician spraying chemical cleaner onto a dismantled aircond coil with a drip sheet protecting the floor](/images/featured/technician-spraying-chemical-cleaner-onto-a-disman.webp)

You know how quickly air conditioning units lose their cooling power in this intense Malaysian heat.

Our team founded Aircond Service Pro Shah Alam with a simple mission: to provide exceptional HVAC services that customers can truly rely on.

This commitment means showing you exactly what happens when your unit gets completely stripped down.

We often see homeowners in Petaling Jaya and Shah Alam paying for basic wiping when their system desperately needs a deep internal wash.

Let’s walk through the complete aircond chemical wash process so you know exactly what to expect chemical wash services to deliver.

## Before the Work Starts: Dismantle and Protection

The aircond dismantle and clean process begins with protecting your living space. Our technicians secure a heavy-duty plastic drip sheet directly against the wall beneath the indoor unit. A thick waterproof cover also goes over your floor to prevent any mess.

We do this to catch all the dark, contaminated water that streams out during the heavy rinsing phase. Your walls and flooring stay completely clean from start to finish.

Our chemical wash service

[/aircond-chemical-wash/ →](/aircond-chemical-wash/)

 involves taking the indoor unit entirely apart. The technician carefully detaches several core pieces:

-   **Front Panel & Filters:** These surface elements come off first to expose the interior.
-   **Blower Wheel:** We extract this cylindrical fan to clean off trapped lint.
-   **Evaporator Coil:** The heavily soiled cooling fins are prepped for soaking.

We easily apply this straightforward sequence to standard units from popular Malaysian brands like Panasonic and Daikin. The process for ceiling cassette units requires more effort since the casing drops down from the ceiling, but the core principle remains identical.

By the time dismantling finishes, the actual coil and blower wheel are fully exposed. We routinely see these internal components caked in a thick layer of brown or grey dirt, especially if the unit has not been washed in over a year.

This heavy buildup severely restricts airflow and makes the compressor work much harder. If you want to understand exactly what each of these components does, check out this guide on 

what a chemical wash is

[/guide/what-is-aircond-chemical-wash/ →](/guide/what-is-aircond-chemical-wash/)

 for a plain-language explanation.

![Aircond drainage pipe being flushed during a chemical wash with clean water running through](/images/content/aircond-drainage-being-flushed-during-a-chemical-w.webp)

## The Chemical Coil Wash and Drainage Flush

With the coil and blower exposed, the technician sprays a professional-grade alkaline coil cleaner across the aluminum fins. Our specific chemical solutions, such as Kool Wash, are formulated to dissolve grease and heavy biological growth without corroding the delicate metal. The foam sits for a few minutes to deeply penetrate the stubborn buildup.

We then blast the area with a high-pressure water rinse to flush everything out. Recent industry data shows that a chemical wash removes up to 99% of internal dirt, compared to just 30% from a standard surface wiping.

Next, the technician gives the blower wheel the exact same deep-cleaning treatment. Our team vigorously scrubs and soaks the blades to strip away layers of lint, dust, and accumulated mould. This specific step eliminates that sour, musty smell that many older units develop in humid climates.

The drainage tray and pipe require a separate, high-pressure flush. We often find a thick biofilm, locally known as “aircond jelly,” blocking the drain path. This slimy buildup actually causes up to 90% of water leaking issues in Malaysian homes. Our thorough flushing completely clears out this algae, ensuring condensation flows smoothly outside.

> **What the runoff water tells you**
> 
> During the rinse, the water that drips off the coil is often surprisingly dark brown or grey. This is completely normal and is a visible sign of how much contamination has been removed. After the flush, the water should run clear, which confirms the coil is clean.

## Reassembly, Gas Top-Up and Cooling Test

Once the coil and blower are clean and thoroughly dried, the technician reassembles the unit in reverse order. Our technicians double-check every single fitting, clip, and panel to ensure they are seated tightly. A proper seal prevents annoying rattling noises once the machine turns back on.

At Aircond Service Pro Shah Alam, every chemical wash includes a free gas top-up of up to 10kg covering R22, R32, and R410A refrigerants. We connect a pressure gauge directly to the outdoor compressor to verify the refrigerant levels. The technician tops up the gas to the exact required PSI if it falls below the standard line. Our free gas refill is permanently included in the quoted price, so you never face hidden charges.

Finally, the technician switches the unit on and lets it run for a few minutes. We run a three-point performance check:

-   **Airflow Strength:** The fan should push air out powerfully without hesitation.
-   **Outlet Temperature:** We measure the cold air to ensure optimal cooling.
-   **Drainage Flow:** The water must drain outside without backing up.

You will notice significantly colder air coming from the vents almost immediately. Studies indicate that a fully cleaned aircon unit uses 15% to 30% less electricity, saving you real money on your monthly TNB bills.

Here are the standard aircond chemical wash steps Malaysia homeowners can expect from start to finish:

| Step | What Happens |
| --- | --- |
| 1. Protection | Drip sheets laid, area cleared |
| 2. Dismantle | Front panel, filters, blower, coil removed |
| 3. Chemical spray | Coil cleaner applied, left to work |
| 4. Rinse | High-pressure rinse, dirty water drained |
| 5. Blower clean | Blower wheel scrubbed and rinsed |
| 6. Drainage flush | Drain tray and pipe cleared |
| 7. Reassembly | Unit put back together |
| 8. Gas top-up | Refrigerant checked and topped to 10kg free |
| 9. Cooling test | Unit run, airflow and temperature checked |

People frequently ask us how long does chemical wash take to complete. Our typical service takes about 60 to 90 minutes for a standard wall-mounted unit.

You do not need to vacate the room, though you might notice a faint chemical scent during the foaming step. We recommend opening a window for a few minutes while the high-pressure rinse happens.

If you are tired of weak airflow and high electricity bills, 

book a chemical wash

[/contact/ →](/contact/)

 with us today. Our service area covers Shah Alam, Setia Alam, Bukit Jelutong, Kota Kemuning, Petaling Jaya, and the wider Klang Valley. A clean system cools your room faster and protects your family from breathing in harmful mold spores.

## Need a senior technician you can trust?

Fixed transparent pricing, a free gas top-up on every chemical wash and repair, and a 30-day workmanship warranty. We serve Shah Alam and the wider Klang Valley.

Learn more about Aircond Chemical Wash

[/aircond-chemical-wash/ →](/aircond-chemical-wash/)

 

WhatsApp Us

[https://wa.me/60122252623?text=Hi%2C%20I%20have%20a%20question%20about%20aircond%20service. →](https://wa.me/60122252623?text=Hi%2C%20I%20have%20a%20question%20about%20aircond%20service.)

Guide FAQ

## Common Questions

How long does an aircond chemical wash take?

A typical wall unit takes about 60 to 90 minutes from start to finish. Ceiling cassette and ceiling suspended units take longer because they are more complex to dismantle and reassemble, usually 90 minutes to 2 hours per unit.

Do I need to prepare anything beforehand?

Clear the area under and around the indoor unit so the technician has room to work and lay down drip sheets. Have a nearby power point available and, ideally, access to a water source. You do not need to do anything to the unit itself.

Will a chemical wash make a mess in my home?

No. Technicians lay drip sheets on the floor and wall below the unit to catch all the dirty water that runs off during the rinse. The area is left clean when the job is done. The runoff water does look quite dark from the accumulated dirt, which is expected and a good sign the wash is working.

## Related Guides

### Aircond Chemical Wash Price Guide: What Affects the Cost

What drives aircond chemical wash cost -- HP rating and wall vs cassette unit type. Transparent pricing from RM160 with a free gas top-up.

Read guide

[Aircond Chemical Wash Price Guide: What Affects the Cost →](/guide/aircond-chemical-wash-price-guide/)

### Chemical Wash vs Chemical Overhaul: Which Do You Need?

Chemical wash vs chemical overhaul -- what each term means, how deep the cleaning goes, and which one your aircond actually needs.

Read guide

[Chemical Wash vs Chemical Overhaul: Which Do You Need? →](/guide/chemical-wash-vs-chemical-overhaul/)

### How Often Should You Chemical Wash Your Aircond?

Chemical wash a home aircond about once a year -- more often for heavy use, pets or dusty areas. See what shortens the interval.

Read guide

[How Often Should You Chemical Wash Your Aircond? →](/guide/how-often-chemical-wash-aircond/)

### Signs Your Aircond Needs a Chemical Wash

Weak cooling, musty smell, water dripping or visible mould? Here are the clear signs your aircond needs a chemical wash.

Read guide

[Signs Your Aircond Needs a Chemical Wash →](/guide/signs-aircond-needs-chemical-wash/)