Removing Mud and Silt After a Flood
Tools, Order and Mistakes to Avoid

Why mud has to come out while it is still wet

Flood mud is not garden soil. It is fine silt carried in by the water, mixed with drain water, sewage and whatever the flood picked up on its way. Wet, it is heavy but it moves: it can be shovelled, scooped and pushed. Once it dries it sets into a crust on floors, packs into grout lines and corners, and has to be soaked and scraped loose, which takes far longer and uses far more water.

Floods in the Klang Valley can leave a lot of it. After the December 2021 floods, a resident of Taman Sri Nanding in Hulu Langat told The Malaysian Insight that his family was left with more than 0.3 m of mud once the water went down, and the outlet reported that residents were still clearing up three weeks after the floods. A thick layer like that is a job for several people with shovels, not a mop and a bucket.

Safety before you pick up a shovel

Mud work is heavy, slippery and dirty, and it is done in a house where the electrics may still be live. Get these right before anyone starts:

• Electricity off. TNB's flood advice is that the main switch at the distribution board must be off before any cleaning. The US EPA's advice is not to enter at all until you are sure the electricity is off, because standing water and wet outlets are a shock hazard.
• Photos first. Photograph every room, the water line and the depth of mud before you move anything. Once it is shovelled out, that record is gone.
• Protective clothing. Rubber boots, rubber gloves and long trousers. The US EPA notes that things touched by flood water can carry bacteria and mould spores, and recommends a face mask and goggles where mould is being cleaned.
• Cover cuts. The US EPA lists wound infections and rashes among the health effects of contaminated flood water, and Malaysia's Ministry of Health has warned of leptospirosis risk after floods. Keep cuts covered and out of the mud, and see a doctor if you feel unwell afterwards.
• Keep children and pets out while the mud is being removed.

Tools for the job

Most of the work is done with simple tools. Power tools only help at the end, once the bulk is out.

Petrol-powered water jets come up after every big flood for a reason. After the 2021 floods, a Selangor assemblywoman helping in Taman Sri Muda told The Star that residents needed high-powered water jets to get the mud out, and petrol-powered ones because they had no power supply. Until the house wiring has been tested, do not run a pressure washer from the house sockets.

The order: top down, inside out, drains last

Working in the right order means each area is cleaned once. Working in the wrong order means walking mud back over a clean floor, or flushing it into a drain you then have to clear.

1. Open everything. Doors, windows, the back door and the gate, so there is a clear path out and air moving through.
2. Clear the floor of soaked items that are going to be thrown away, so you can get at the mud. Photograph them first.
3. Start upstairs if water reached it, then the far end of the ground floor, working towards the front door.
4. Shovel and squeegee the bulk out of each room, through the door and well away from the house. Do not wait for it to dry.
5. Scrub and rinse the thin film left on floors, walls and skirting, pushing the muddy water out of the door rather than down a floor trap.
6. Do the porch, yard and car porch last inside the boundary, because mud from inside passes over them.
7. Clear the drains last of all, once no more mud will be washed into them.

Tiled floors, grout and skirting

Most Klang Valley homes have ceramic or porcelain tiles on the ground floor, which is good news: tiles survive a flood far better than timber or laminate. The mud comes off the tile surface easily while wet. The slower work is the grout lines, the joint between the floor and the skirting, and under kitchen cabinets, where silt packs in. A stiff brush and repeated rinsing lift most of it.

Tap the floor as you go. A tile that sounds hollow may have water under it, and the bed beneath may need to dry or the tile re-laid later; do not try to fix that during the clean-up. Timber skirting and laminate or vinyl planks that sat in the water usually need to come up so the floor underneath can dry. Mud cleaning is not the moment for repairs; it is the moment to note what will need them.

Walls, doors and cabinet bases

Wash walls from the top of the water line downwards, so dirty water runs onto areas you have not cleaned yet. Brick-and-plaster walls can usually be washed and left to dry; the mud on them is mostly on the surface. Gypsum board partitions that soaked up water are a different matter and usually come out later.

Kitchen and wardrobe bases made of particleboard soak up mud and water from below. Empty them, pull out the kick plates if they come away, and shovel out the mud that collects behind them; it is one of the places where smell and mould start. Doors and frames are washed down and propped open so they can dry. Whether the cabinets can be kept is a separate decision, covered in the clean-up stages of a flood cleaning service.

Floor traps, drains and the inspection chamber

This is the single most common mud-out mistake. Hosing mud into a floor trap, a bathroom drain or the kitchen sink feels like the quickest way to get rid of it. It is not: the silt settles in the bends of the pipe and in the drain outside, sets hard, and causes the next overflow, often during the next heavy rain.

• Cover floor traps with a plate or a bag weighed down while you work, so mud cannot be pushed into them.
• Push mud and muddy water out of the door into a heap or bags, not down the drain.
• Once the house is clear, rinse each floor trap and check that water runs away freely.
• Lift the inspection chamber cover outside, with gloves, and look: silt collects there too.
• Clear the perimeter drain round the house last, when nothing more will be washed into it.

If a drain is already blocked with silt, standard methods are in the blocked drain cleaning guide; packed silt inside a buried pipe usually needs hydro-jetting. Where the same outdoor drain fills with sand every year, a silt trap collects it in one place where it can be dug out.

Where the mud and rubbish go

Mud shovelled out of the house still has to go somewhere. Heaping it against the boundary wall or pushing it into the monsoon drain only moves the problem down the street, and blocked public drains make the next flood worse for everyone. Bag it or heap it where it can be collected, away from drains and gratings.

Who collects flood rubbish, and when, depends on where you live; collection arrangements differ from council to council and are usually announced after a flood, so check with your local council. Furniture, mattresses and appliances are a separate pile, covered in flood debris and damaged furniture disposal.

Common mistakes

Once the mud is out, the next steps are disinfecting the house and drying it out properly. Doing both before any repair is what stops mould coming back.

When to call a crew

A light layer of silt in one room is a job you can do yourself in an afternoon. A thick layer through the ground floor, mud packed under cabinets, a porch full of silt and furniture to carry out is heavy, slow work, and it is usually only the first of several stages. That is when a crew earns its keep.

ClickBina's crew does mud and silt removal as part of a full flood clean-up, together with clearing out damaged furniture, washing, disinfection and drying set-up. We do the non-electrical work. Testing and re-energising the house must be done by an electrical contractor registered with Suruhanjaya Tenaga. For everything else after a flood, start from the flood clean-up, repair and prevention hub. WhatsApp us your area, the property type and how much mud there is, and we reply within the hour.

Sources & references

• TNB press release S.A. 2021/11/131, Panduan Keselamatan Elektrik Semasa Musim Tengkujuh — main switch off before cleaning, and testing by an electrical contractor registered with Suruhanjaya Tenaga.
• US EPA: Coming Home — electricity off before entering, protective clothing and tools (a US source, used where no Malaysian page could be reached).
• US EPA: Doing it Yourself — removing deep standing water gradually.
• US EPA: Protecting Your Health — bacteria, chemical hazards and wound infections from flood water.
• The Sun: MOH warns of leptospirosis risk — Ministry of Health warning after floods.
• The Malaysian Insight: Hulu Langat folk still cleaning up three weeks after floods — the depth of mud left in Hulu Langat homes after the December 2021 floods.
• The Star: post-flood clean-up in Selangor, January 2022 — residents' need for water jets, and petrol-powered ones without a power supply.

How we wrote this: this page gives no prices and no fixed timings. The working order is general practice for flooded homes; electrical advice follows TNB's published flood guidance.