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Vinegar, baking soda, tea tree oil in the unit – do 'natural' remedies work?

Editorial guide · Updated 18 September 2026

In short Short answer: none of them removes the biofilm – at best they 'kill' it at the surface, and dead mould is just as allergenic. Vinegar corrodes aluminium and copper, baking soda stays as powder on the fins, tea tree oil is a respiratory irritant and food for biofilm. The most 'natural' thing to do is water: pressure washing, with a cover, once a year, and daily drying.

This page explains a situation in an editorial format. It is not an open discussion board or a verified customer review. Contact us on WhatsApp about your own appliance.

Situation discussed

Drumul Taberei, Tudor Vladimirescu street, 9,000 BTU Samsung, 4 years old. I do not want chemicals at home (small child). I read in a group that white vinegar sprayed on the evaporator kills mould, or baking soda, or a few drops of tea tree oil in the pan. What works and what does not?

Editorial explanation · Revizie AC

What is really happening

We understand the concern for the child – which is exactly why the EPA principle matters: mould is physically removed, not 'killed' in place, because dead spores and fragments remain allergenic and resuspend when the fan starts. Vinegar is acetic acid: on the evaporator's aluminium and the copper pipes it causes corrosion, and acid fumes in a child's bedroom are not 'natural' in any useful sense; manufacturers explicitly allow only water and neutral detergent. Baking soda cannot reach the roller and remains as a white deposit that holds moisture. Essential oils are volatile organic compounds with irritant potential for small airways, and in the pan they become a carbon source for bacteria. Laboratory tests on antifungal agents show variable efficacy and, above all, that they do not remove already-deposited spores. Pressurised water is, literally, the cleanest method.

Explanatory diagramFilters: check the manual before cleaning
Filters: check the manual before cleaning
  1. Switch off and follow the safety instructions in the manual.
  2. Wash only filters identified as washable by the manufacturer.
  3. Let them dry as instructed before refitting.
What the studies say
  • EPA principle: mould must be physically removed, not merely 'killed'; biocides are not recommended as routine practice. [US EPA, 2024]
  • Mould remains allergenic even when dead, so merely 'killing' it with a spray does not solve the problem – it must be physically removed. [US EPA, 2024]
  • Manufacturers prohibit benzine, thinner, scouring powder or insecticide on the indoor unit; only water and neutral detergent are allowed. [Mitsubishi Electric, 2020]
  • Antifungal agents tested in the laboratory show variable efficacy against indoor air fungi, and many do not remove already-deposited spores. [International Journal of Environmental R, 2015]

What we do on site

  1. Collection cover; cleaning solution (alkaline, biodegradable, no chlorine, no fragrance) on evaporator, roller, pan.
  2. Pressure wash in place with plenty of water – this is where most of the result comes from.
  3. Sanitising solution at the minimum effective dose, then an extra rinse – in a home with a small child, zero residue.
  4. Full drying on 'Fan' before we leave.
  5. Outdoor unit, washed in place.
  6. See current rates on the Prices page.

What you can do yourself

  • The most 'natural' measures with real effect: 'Fan' 20–30 minutes before shut-off, filters washed in warm water and a little dish soap every 2 weeks, humidity 40–55%, daily airing.
  • Louvres and housing – cloth with soapy water.
  • Torch on the roller once a season.

What NOT to do

  • Do not spray vinegar, alcohol, hydrogen peroxide or oils on the evaporator.
  • Do not put baking soda, salt or 'tablets' in the pan.
  • Do not confuse 'natural' with 'safe for aluminium and lungs'.

Prevention

Water, drying, clean filters, one wash a year – that is the truly 'chemical-free' routine.

When to call us

0764 012 943 / WhatsApp, Monday–Saturday 08:00–20:00. Drumul Taberei.

Technician showing the customer the clean filter, bucket of dirty water beside
Technician showing the customer the clean filter, bucket of dirty water beside
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The information on this page is educational and based on cited sources; it does not replace medical advice. We do not do repairs, installation or refrigerant circuit work.