How to Remove Excess Mortar

Excess mortar is a problem with almost all stone and brick installations, which is why it's important to wipe up damp mortar during the install. If you have excess mortar that has dried onto the surface, more extensive cleaning techniques are required. The mortar removal process must be performed carefully since it involves the use of harsh acids that can cause injury if used improperly. However, the acid will effectively dissolve the mortar and restore the surface.

Thick rubber gloves
Safety glasses or face shield
Chisel or trowel
Hammer
Water
Ladder (optional)
Bucket
Masonry cleaner
Soft-bristled masonry brush

Instructions

- 1
  Put on thick rubber gloves and a face shield or safety glasses. Place a ladder next to the area, to reach the upper portions if you are working on a wall.
- 2
  Examine the surface to locate any large chunks of dried mortar. Place the tip of a chisel or the pointed end of a trowel at the base of the mortar. Tap the handle of the tool to chip off as much as possible. Repeat the process to chip off all other large chunks without damaging the surface.
- 3
  Saturate the entire surface with water until no part of it appears dry. If you are outside, this is most easily accomplished with a garden hose.
- 4
  Open a bottle of masonry cleaner, which typically contains muriatic acid. Pour the recommended amount into a bucket and dilute the acid with water if instructed to do so.
- 5
  Insert a soft-bristled masonry brush into the acid and scrub the areas of excess mortar using firm, circular motions.
- 6
  Allow the cleaner to sit on the mortar for approximately three to six minutes.
- 7
  Scrub the entire area to remove the softened mortar. If the mortar does not come off easily, allow the solution to soak for an additional minute.
- 8
  Rinse the area thoroughly with clean water to remove all traces of the chemicals, which will deteriorate the surface over time.

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