A chemical wash is the most thorough clean a home aircon gets — and it's where customers are most often shortchanged, because most of the work happens inside the unit where you can't see it. If you're paying for a chemical wash, here's what should actually be done, so you know whether you got one.
What should happen, step by step
- 1. The area is protected. A proper job starts by covering the wall and floor below the unit with a service bag or sheeting to catch the dirty water and chemicals.
- 2. The unit is opened up. The cover and filters come off, and the unit is partially dismantled so the technician can reach the evaporator coil and the blower wheel. On some jobs the indoor unit is taken down entirely for a deeper clean.
- 3. The coil is chemically cleaned. Specialised coil cleaner is applied to dissolve the packed grime, mould and bacteria, then flushed through. This is the core of the job — it's what restores the coil's ability to absorb heat.
- 4. The blower wheel is cleaned. This is the part most often skipped. The blower wheel — the spinning barrel that pushes air out — collects a thick layer of dust and mould that a surface clean never touches. A real chemical wash cleans it.
- 5. The drain line is flushed. The condensate drain is cleared so water flows away freely and the unit doesn't start leaking afterwards.
- 6. The outdoor unit is cleaned. A complete job cleans the outdoor condenser too — it has to release heat, and a grimy one drags the whole system down.
- 7. Reassembled and tested. Everything goes back together and the unit is run to confirm it's cooling properly and draining cleanly.
How long it should take
A genuine chemical wash takes roughly 1 to 1.5 hours per unit. If someone is in and out in 20 minutes, they did not do the steps above — there isn't time to.
Signs you got a fake chemical wash: it was over in 20 minutes; only the filter and front cover were touched; the blower wheel was never cleaned; the outdoor unit was ignored; there was no protective sheeting and no dirty run-off water to show for it. If the unit still smells or cools weakly afterwards, the deep clean almost certainly didn't happen.
What to ask
You don't need to be technical. A couple of simple questions tell you a lot: “Will you clean the blower wheel as well as the coil?” and “Is the outdoor unit included?” A technician doing a real chemical wash will answer easily, because it's just describing their normal work. Want to know whether you even need a chemical wash in the first place? See chemical wash vs standard cleaning.
At ServisYou, a chemical wash is RM280 per unit and the outdoor unit is included as standard — not an extra. Every job is fixed-price and backed by a 7-day guarantee, so “the deep clean didn't happen” is never your problem to absorb.
Common questions
Want a chemical wash done properly?
Coil and blower cleaned, outdoor unit included, fixed RM280/unit, 7-day guarantee. Book a verified partner online.
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