Meranti+ Nesting Plank Enhancer · Mouldy Planks?

Meranti is the wood. Meranti+ looks after the wood.

Many people ask: is Meranti not the wood the planks are made of? Yes, most nesting planks in Malaysia are Meranti. Meranti+ is a care solution made for these planks: it removes mould, removes the smell and prevents mould. It is not an aroma and not a hormone, and it does not call birds in. Its job is to clean the birds' home. Once the planks are clean, the birds can increase.

It started in our family's housesThe first product MDK ever made was for the founder's father's swiftlet houses. A poor quality humidifier had left the planks in two houses badly mouldy. Nobody had an answer, so we found an anti-mould product ourselves and had a factory make a version just for swiftlet houses. It was first called Fungus Killer. Today it is Meranti+.

In a customer's words“Thank you Meranti+, it makes things much easier. Spray water first, scrape, then spray Meranti+. Washing with water alone will definitely go mouldy.”
A swiftlet house owner in East Malaysia, June 2026 (translated from Chinese)

Want a closer look before you decide? The details are below ↓

What it can help with, and what it cannot

It helps

Mould, moss and musty smell on the planks.

It breaks down the mould and the smell on the plank, with no wiping plank by plank. Only old nest bases and the worst patches need clearing first. Planks with nests can be sprayed as they are, no need to wait until after harvest.

New planks need it too. The wood carries mould from the day the tree is cut. Spray new planks before installing them, to stop mould before it starts.

Not enough on its own

Mould always has a cause. If the cause stays, the mould comes back.

Standing water below, moisture rising all the time, or no air movement inside. If those stay, new planks go mouldy too. You are replacing money, not the problem.

Fewer nests is not always about the planks. If the entrance hole, the flight path or the sound is holding things back, the birds will not come in however clean the planks are. We look at all of this for free, just send a video.

The honest part, up front: not every black spot will go. White powder usually disappears on its own; black spots depend on how bad they are. This is regular maintenance, not one spray that lasts forever.

How to use it: three steps

STEP 1 · Mix1 part Meranti+ to 80 parts water. A 16 litre sprayer takes 200 ml. Stronger is not better.

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STEP 2 · Spray in the morningSpray on a sunny morning and finish before 1pm (before 12pm in East Malaysia), so the plank surface is dry before the birds come home. Planks, nests and chicks can all be sprayed directly; just do not spray straight at a tweeter diaphragm.

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STEP 3 · Go up and lookCheck the colour and smell of the planks. What matters is that the planks stay clean, not whether a few black spots vanish right away.

How many sprayers per house: a two storey shophouse of 20 x 70 ft, every plank sprayed, takes about 3 at a normal pace. A guide only, since everyone sprays at a different rate.
How often: spray once after washing the planks, again three to four months later, then every six to eight months. In the rainy season the planks stay damp more easily, so shorten it to about every two months. A top up after harvest is recommended.
With insecticide: same day is fine, but the order matters. Spray Meranti+ on the planks first, wait 15 to 20 minutes, then spray insecticide on the walls and floor. Chalcid and Fendona must not go on the planks; if the insects are bad and the planks must be treated, use one that is suitable for planks, such as Seclira.
For the person spraying: wear eye protection.

Something I once wrote, and have taken back

In my 2012 book I wrote that planks that are not too dirty do not need washing, because washing makes them damp and mouldy. That reasoning still holds: wash with plain water and the planks really will go mouldy.

What changed is the tool. There is now a product made for nesting planks that cleans without damaging them. So I changed my answer: planks that have never been washed should be washed, whether the house is new, five years old or ten.
MD Koay

How to buy, plainly

Where to buy: the buy buttons on this page take you to the Meranti+ page in our online shop, Kedai Dr.Burung. The price and delivery are there and always current.
1 litre or 4 litres: one 1 litre bottle covers a whole house. If you have several houses or already spray on a schedule, take the 4 litre.
Buy five, get one free: on the 1 litre, within Malaysia only, calculated automatically in the cart.
Customers outside Malaysia: liquids are harder to ship abroad, so please WhatsApp us first.

FAQ

Does it smell? Will the birds leave?

Once diluted it has almost no smell. It will not stop birds coming in or make them move out.

Can I spray while there are nests and birds living there?

Yes, with or without nests. Starting early also helps prevent mould.

How is it different from ordinary plank cleaners?

Almost every plank cleaner on the market has to be wiped on by hand, plank by plank. Meranti+ is sprayed. You only need to deal with old nest bases and the worst patches.

Do I have to climb up and wipe the planks?

Not every house needs it. Tell us how old the house is and roughly how many nests, and we will tell you.

I do not harvest. Do I still need to look after the planks?

Yes. The planks are the birds' home. Once it is mouldy and smells, no one wants to live there. Past a certain point, spraying will not save a plank, and then you are paying for new planks.

Is it safe?

Lab tested, with a test report. Safe to spray directly on planks, nests and chicks.

Why is there no price on this page?

Prices change, so we keep them in our online shop, Kedai Dr.Burung, which is always current. This page only covers what the product is, how to use it, and whether it suits your house.

Planks clean, but still no more birds? That is where our real work begins.

The planks are only one part of the house. If the entrance hole, the flight path or the sound is holding things back, the birds will not come in however clean the planks are. This is the MDK Swiftlet House Diagnosis Method: diagnosis first, prescription second.

Take your phone and film your way in from the entrance hole, talking as you go. Record the internal sound for a while, then switch to the external sound and record that too, and send it to us. It does not have to be a good video. If we need more after looking, we will ask. You do not have to prepare everything at once. It is free.

Send us a video

Mouldy nesting planks? Spray, no wiping plank by plank.