The Aircon Chemical Wash Process, Step by Step

Our team at PG1 Aircond has spent over 15 years perfecting the aircon chemical wash process for homes across Penang. High humidity in Malaysia forces cooling units to work overtime, leading to stubborn mold and algae buildup.

We frequently see how this hidden dirt restricts airflow and spikes electricity bills by up to 30%.

A proper deep cleaning takes about 45 to 90 minutes per unit. Our technicians follow strict chemical wash steps to restore your system completely.

This guide outlines exactly how chemical wash is done during a professional visit so you know what to expect. If you’re still deciding whether you need one, start with what an aircon chemical wash actually is.

Step 1: Arrival and assessment (5 minutes)

We start every job by assessing the indoor unit to confirm a chemical wash is actually necessary. Many cooling issues stem from a simple dirty filter, which only requires a basic service.

Our technicians will explicitly tell you if a cheaper, standard cleaning is sufficient before starting any work. A standard service in Penang currently averages around RM99 to RM120, while a full chemical wash ranges from RM150 to RM250.

We never want you to pay for the wrong service. This honest evaluation builds a solid foundation for a great working relationship.

Step 2: Setup (5 minutes)

We lay down a thick floor tarp directly under the unit to protect your flooring. The next step involves wrapping the indoor unit in a custom waterproof service bag.

Our setup process includes a few critical protective measures:

• Floor Protection: Thick tarps prevent water damage to your tiles or wood.
• Service Bag Attachment: A custom funnel bag catches all runoff.
• Drainage Routing: A heavy-duty hose directs wastewater to a safe drain.
• Furniture Coverings: Nearby items are shielded from accidental splashes.

Proper setup gives you peace of mind while the messy work happens.

We always secure the area completely before opening any chemical bottles. A clean workspace is just as important as a clean air conditioner.

Step 3: Dismantle (5 to 10 minutes)

We begin the teardown by removing the front panel and setting the air filter aside. Access covers are carefully detached to expose the internal evaporator coil.

Our team then extracts the blower wheel from most wall split units. This specific step is what most fast service jobs skip entirely.

We chemically clean this plastic wheel separately to eliminate the thick mold that forms in humid climates. Removing the wheel makes a massive difference in restoring strong, fresh airflow.

Step 4: Chemical application (10 to 15 minutes)

We spray a specialized alkaline coil cleaner directly onto the evaporator coil and let it soak. Products like CULMI 138 or Seagull alkaline formulas safely dissolve grime without corroding the delicate metal fins.

Our technicians avoid harsh acidic cleaners, as those can severely damage the aluminum components over time. Here is why alkaline is the standard for indoor units:

We mix a milder solution specifically for the plastic blower wheel to prevent warping. The water tray is scrubbed by hand while the main chemicals activate.

Step 5: Pressure rinse (10 to 15 minutes)

We use a pressurized water jet to blast the dissolved grime out of the coil and blower. Thick, brown-grey water will immediately start flowing into the protective service bag.

Our technicians keep rinsing the system until the runoff water is completely clear. That dark water represents the hidden dust and mold spores you have been breathing in daily.

We also pressure-wash the outdoor condenser unit at this stage. Clearing the outdoor fins reduces strain on the compressor and improves the cooling efficiency.

Step 6: Drainage flush (5 minutes)

We send compressed air or highly pressurized water through the condensate drain line. This step tackles three main threats trapped deep inside the PVC pipe:

• Thick algae growth.
• Built-up dust and debris.
• Stubborn bacterial slime.

Our experience shows that Malaysia’s intense humidity causes these pipes to clog rapidly. A drain pipe in Penang can become completely blocked by algae in just six months, causing severe indoor water leaks.

We flush this line aggressively to prevent those frustrating late-night puddles. A clear drainage system is the only way to permanently stop water from dripping down your walls.

Step 7: Filter clean (parallel)

Our team assigns one technician to handle the air filters while the main coil dries. The reusable mesh filters are thoroughly washed, scrubbed with a soft brush, and rinsed clean.

We ensure they are completely dry before putting them back to prevent new mold growth. Clean filters are essential for trapping airborne dust and pet dander.

Step 8: Reassembly (10 minutes)

We carefully reinstall the blower wheel once all internal parts are dry. Reassembly involves several quick actions:

• Refitting the access covers securely.
• Slotting the clean filters back into place.
• Snapping the front panel onto the chassis.
• Removing the service bag and floor tarp.

Our technicians finish by wiping down the exterior plastic casing and the surrounding wall area. Leaving the workspace spotless is a mandatory standard for professional technicians.

We take this cleanup step very seriously. A tidy room reflects a high-quality service job.

Step 9: Test and verify (10 to 15 minutes)

We switch the unit on in cooling mode to run a final performance test. The system needs to run for about 10 to 15 minutes to stabilize the refrigerant pressure.

Our team checks three specific metrics during this testing phase:

• Temperature Drop: Confirming a healthy 8 to 12-degree Celsius difference across the coil.
• Airflow Strength: Ensuring the blower wheel pushes air efficiently without restriction.
• Noise Levels: Listening for smooth motor operation free from rattling or strain.

Neglected units often jump from a weak 5-degree drop right up to a crisp 10-degree difference.

We consider this measurable jump the ultimate proof that the deep clean worked. You will immediately feel a stronger, noticeably colder breeze filling the room.

Step 10: Walkthrough and tips (5 minutes)

We sit down with you before leaving to explain exactly what was found inside the unit. A quick debrief includes specific maintenance tips matched to your room layout and usage habits.

Our technicians will suggest a realistic cadence for your next wash if the coil was heavily fouled. Units in kitchens or dusty environments often need attention sooner than bedroom units.

What the right aircon chemical wash process looks like

We stand by three specific details that separate a proper chemical wash from a superficial wipe-down. Many budget contractors heavily discount their prices by skipping the most difficult labor steps.

Our standard process guarantees these critical components are handled correctly:

1. The blower wheel is removed and washed separately. This plastic part is the primary source of musty smells, and cheap services simply spray it in place.
2. The water tray is scrubbed by hand. A tough film of algae forms here, and a simple chemical spray cannot break it down entirely.
3. The drainage line is aggressively flushed. Clearing this pipe is the only definitive way to fix and prevent indoor water leaks.

A cheap service that skips these steps leaves your machine hiding severe grime.

We regularly fix units that still leak right after an RM80 budget wash. Proper maintenance prevents these frustrating follow-up repairs.

How long it takes

We typically complete a standard wall-mounted split unit service in 45 to 60 minutes.

Heavily soiled machines or complex ceiling cassette units take 60 to 90 minutes due to the extra dismantling required. Our team scales the time efficiently for multi-unit jobs, as the initial setup overhead drops per room.

A deeply cleaned system cools a room in under 10 minutes, saving you hours of wasted electricity.

We are ready to handle your aircon chemical wash process today. See the chemical wash service page for pricing and to schedule a slot.