Applying a concrete dissolver is one tactic used to soften old mortar on masonry tools equipment and vehicles.
Remove concrete from metal siding.
Step 3 keep the wand horizontal or angled downward.
Chip away small chunks of concrete from your siding with a putty knife.
If water alone doesn t work try using a spray bottle full of water with a few drops of dish soap to wet the concrete.
For areas with a large amount of splatter using a putty knife may not be feasible.
Hold the tip about 2 feet from the siding and gradually reduce this distance until the concrete loosens and blows away.
The tip should never point up this orientation allows water to get under the siding and soak the sheathing creating possible mold and rot problems.
Then scrape off the concrete gently with a putty knife.
To treat a large amount of concrete spatter these are safer to use than the traditional solution of muriatic acid.
Its mild acid and foaming agent also dislodge unwanted concrete deposits from glass metal most plastic painted and wood surfaces.
In addition to aluminum this process can be used for galvanized metals block brick and metal building panels.
While preventing buildup while you work is the best defense you cannot always do so.
A number of sugar based commercial products are available to remove concrete.
It may be helpful to wet the concrete which helps to soften and loosen it from the siding.