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[Corew]

Ok I tried preparing a trench outdoors, fill it partially with water with a pump, meeting area, and wait for some blood cleaning. After a while, some blood started to get into the trench. After this ... i tried take all the water away (with another pump), and refill ... but... finally a lot of contaminants went to the walls. Now i dont know how to clean this.

I tried fill to 7/7 all the trench... untiul the water flooded the nearby areas, result was cleaning blood in the nearby areas... and spreading the blood in all a circular area 4/5 tiles far from the trench... And the blood on the walls still is there.

Both pumps were in the up part of the trench. perhaps pump in a lower part works better?

[Sphalerite]

As far as I can tell, blood which is in or on walls is impossible to remove without deconstructing the wall.  Even magma won't get blood out of walls.

However, as far as I can tell blood on walls doesn't recontaminate water flowing past the wall, so you should be able to ignore it.  Or run DFcleanmap if it really bothers you.

[greycat]

I haven't tested this extensively in .16, so things might have changed, but....

When a dwarf decides to clean a floor tile, the cleaning process also seems to remove contaminants from adjacent walls.  (Not sure if it's just orthogonally adjacent walls, or diagonals as well.)  So, at a guess, if the area in question is Inside, you might be able to contaminate a floor tile next to the wall you want cleaned.  Then wait for a dwarf to clean the floor, and see if that gets the wall as well.

[Hyndis]

You're safe, the water overwrites any blood, so a dwarf who steps into a bloody mess will be protected by the water.

Idle dwarves will periodically clean up the trench. A dwarf will clean the tile he's on, as well as each adjacent tile. If its a small trench this may also include the walls.

[Chocolatemilkgod]

Or if you're lazy you can get the DF hackpack and then just run the cleanmap 

[Corew]

I hoped i could clean this with water but... i see its not gona be possible.

I ll try doing a squads of nurse/cleaners without any work to do...

[Psieye]

Depending on how it's set up, destroying and rebuilding the walls might be easier.

[Skorpion]

Try using dwarf therapist to enable cleaning on children.

[Niveras]

Walls can be cleaned if a dwarf targets an adjacent floor tile for cleaning (since cleaning a tile will also clean the 8 surrounding tiles on the current z-level). However, since technically dwarves can't stand on walls (they would be standing on the floor above), walls don't get directly targeted for cleaning.

As mentioned already, dfhack is currently the only method to clean off a wall... short of mining it out and/or de/re-constructing a built wall, which is a time consuming process depending on how much the contamination has spread.

[Hyndis]

If the cleaning trench is only 1 tile wide, that means if a dwarf cleans up the muck in the water he will also clean up the walls.

However even if nothing is ever cleaned, you're still okay. The water will still clean dwarves, and while a dwarf is coated in water no other substances will stick to him.

[nordak]

Just tried enabling cleaning on children... nope...

[Lord Darkstar]

If you build a wall beside a smoothed bloody wall, does the change of graphics (for the connection) force the tile to be cleaned?

ie:

|
B
|

|
+-
|

Legend:
| regular smooth wall
B Bloody wall patch
- newly constructed wall
+ tile that previously was bloody

Smoothing a bloody non-smooth wall will unbloody it (or it did in 28.40d, so I presume that still works).

[Sphalerite]

Don't know about building adjacent walls, but I have determined that burning objects periodically clear blood off adjacent tiles.  If you drop bins full of burning lignite in your channel, that should remove the blood from the walls.

[Hyndis]

Don't know about building adjacent walls, but I have determined that burning objects periodically clear blood off adjacent tiles.  If you drop bins full of burning lignite in your channel, that should remove the blood from the walls.

It will also remove water from the channel, and flesh from the bones of your dwarves.   

[decius]

Adjust the boiling point of blood in the raws. It's easier than the burning lignite trick, and has the benefit of clearing out all the blood in your fort at once, not just the blood outside of the dwarves.