The Stain Library

Material

Unfinished wood

Raw timber with no protection at all, which absorbs instantly, raises its grain with water and can only be corrected by sanding.

  • SurfacePorous
  • WashingSpot only
  • Colour run riskLow
  • Reviewed7 September 2026

What unfinished wood can and cannot take

  • Heat Avoid
  • Water and soaking Avoid
  • Acids, including vinegar Avoid
  • Strong alkalis Avoid
  • Solvents Avoid
  • Chlorine bleach Avoid
  • Abrasives Use with care

Always test on a hidden area first and let it dry before you treat the visible mark.

General rules for unfinished wood

Nothing about this is a cleaning problem, which is the useful thing to know.

Blot fast and hard, and do not wash it. Adding water to bare timber raises the grain, spreads the mark and adds a water ring of its own, and none of that comes out.

Once it is dry, the honest options are to sand the area or to accept the mark. If it is a floor waiting to be finished, sanding is happening anyway.

Check the label

Bare timber has nothing on it, so a spill is absorbed into the grain within seconds and there is no finish to protect. Water raises the grain, leaves a permanent tide mark, and the only real remedies are sanding and then finishing the wood.

Stains on unfinished wood

Unfinished wood is bare timber, whether a newly sanded floor, a raw worktop or untreated furniture.

It absorbs immediately

There is no finish, so a spill is in the grain within seconds and going deeper. This is the least forgiving surface in the whole flooring family.

Water raises the grain

Wetting bare timber makes the fibres swell and stand up, leaving a rough patch that stays rough after it dries. That is why cleaning it makes it worse.

A tide mark forms

At the edge of the wetted area, exactly as it does on jute or on plaster, and it is usually more visible than the stain.

Sanding is the answer

And on a floor waiting for its finish, that is already the next job, so a mark now is far less serious than it looks.

Sources

What we checked and when. Where a manufacturer instruction disagrees with anything here, follow the manufacturer.

  1. Care and maintenance guidance, Atkinson and Kirby manufacturer

    UK wood flooring maker's guidance to clean spills immediately and not leave wet items on a wood floor, to damp mop with a well wrung mop or a barely dampened microfibre cloth, that steam cleaners and steam mops are not recommended, that oil based, wax based and ammonia based cleaners can damage the floor, and that an oiled floor is maintained by reapplying maintenance oil and polishing it until the surface looks uniform.

    Checked 7 September 2026

  2. Restoring water damaged wood floors, Sanding Wood Floors specialist

    UK floor sanding specialist explaining that cupping is where the edges of the planks raise into a cup shape, that water often leaves a dark mark in the wood, that the floor must be allowed to dry out first and that this may take several days, that sanding then removes the warped and damaged layer, and that a buckled floor or one with extensive mould growth needs replacing rather than restoring.

    Checked 7 September 2026

  3. How to clean skirting boards, Skirting World manufacturer

    UK skirting manufacturer guidance that MDF swells if it gets too wet so minimal water is used and the board is dried thoroughly, that a cloth should be damp and not dripping, that warm water with a few drops of washing up liquid handles most cleaning with sugar soap for tougher marks, that harsh chemicals are avoided, and that boards are dried with a fresh cloth rather than left to air dry because that causes streaking and water damage.

    Checked 7 September 2026