A wire brush can be used to scrub away dried mortar from the area but that can take quite some time if you do it by hand.
Removing mortar from roof tiles.
Scrub the mortar with a scrub brush to remove the residue the.
Remove a piece of tile from the solution.
How to remove mortar from old tiles for reuse.
A wire brush attachment for a hand drill cuts the time in half and gives the slate a clean surface in no time.
Pay special attention to areas that may have excess mortar such as grout lines on a tile floor and grout joints on a tiled backer board.
In this video i use muriatic acid diluted with water to remove dried mortar from ceramic tile.
Gently use a scraper or razor blade to work unusually thick areas.
When the job of removing dried mortar seems more involved there are a few tools you should consider using.
This is for minor mortar stains.
Add 1 cup of muriatic acid to the container and stir it.
Spray the area with the vinegar and wipe down with the sponge.
The thin set instructions say to sponge off any mortar from the tops of the tiles immediately or at least as soon as possible.
Make sure to apply pressure to the areas with the thickest layer of thin set.