How to Clean a Cement Mixer

Here is a sure method of cleaning a cement mixer drum that is really caked in cement and makes it almost unusable. The following procedure may burn the paint off the exterior of the drum. But hey, it isn’t any use in the state it’s in now, right?


  1. 1
    Remove the drum from the mixer. This is usually done by turning the drum in the opposite direction to that of its normal rotation.
  2. 2
    Place the drum on its side and put some firewood and paper into the drum and set alight. The drum needs to be on it’s side so it can draw in air. If the drum is upright, it will not and the fire will go out.
  3. 3
    Once lit, keep burning for approximately 1 hour. You can use a little coal to increase the heat and keep the fire in. After approximately 1 hour the drum will be EXTREMELY HOT. (take care when handling!)
  4. 4
    Cool the outside of the mixer drum with cold water. (Do not wet the inside of the drum)
  5. 5
    Empty the drum of burnt coal & or ash.
  6. 6
    Replace cooled drum back on the mixer. (Remember to grease the spigot)
  7. 7
    Use a claw hammer or small chisel to chip away the old cement. This will take a little while depending upon how badly the drum was coated with old cement.
  8. 8
    Avoid banging the outside of the drum, as this could dent and damage it.
  9. 9
    When the worst of the cement has been loosened, tip it out into a wheelbarrow.
  10. 10
    Pour some water in the drum along with some old bricks or rubble and leave turning for about 30 minutes. You can tilt the drum a little so that the rubble scrapes the upper edges of the drum.
  11. 11
    Empty the drum of rubble and water.
  12. 12
    You should now have a clean cement mixer ready for work again.


  • After cleaning your cement mixer. wipe the inside with red diesel after every use. Before making a new mortar mix wipe the drum dry of diesel fuel as any diesel liquid residue will impair the mortar mix.
  • Brush a light coat of diesel before using it, then wipe it down with a wire brush or wire scrub pad at the end of the day. Avoid rinsing it off during use.

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Categories: Concrete | Home Improvements and Repairs