1.   Applying a good masonry sealer can also help prevent spalling.

2.   Besides, sealing the bricks with an ordinary masonry sealer can trap water inside the bricks, making matters worse.

3.   A possible cure is to apply a coat of masonry sealer, which will make the stone and the mortar more water resistant.

4.   Additionally, you may want to apply a clear masonry sealer to the patio.

5.   After cleaning the brick, Mangan suggests using a masonry sealer that protects the brick from water without blocking the natural movement of air through the brick.

6.   If this works, seal the floor with a masonry sealer.

7.   If the stain comes clean, then seal the grout with a masonry sealer or tile sealer.

8.   If the bricks are porous, you can seal them with a masonry sealer.

9.   If you apply a standard masonry sealer, it might seal in water that would make things worse.

10.   Once you get clean concrete, seal it with a masonry sealer, though that needs renewal once a year.