One of the most difficult parts of brick is that, when un-rendered, they are porous and hold onto paint well, so cleaning graffiti off bricks is definitely a job for the professionals! Plus, when bricks are used to build structures, they can get dirty with construction materials and concrete, so at the end of any brick building process a good clean is required once the concrete is dry.
It's a good idea to get a bricklayer who also does cleaning or at least introduce your brick cleaner to your brick layer before the work starts, because the brick layer can influence how easily the cleaning is done.
Here's a summary of the different methods brick cleaners can use:
Bucket and Brush hand cleaning
This is the most popular method and uses different chemical cleaners including (sometimes) laundry detergent! A professional brick cleaner will know who manufactured the bricks and will usually use the recommended chemical cleaner for the bricks, and leave the solution on for the recommended amount of time after removing the bigger clumps of mortar with a paddle. They'll scrub the bricks with a strong rough brush (like a big toothbrush). Once the bricks are cleaned the solution must be well rinsed otherwise stains and over-cleaning might occur which will look patchy.
Pressurised water cleaning
This method saves time and labour, but isn't exactly the best way if you're under water restrictions or prefer to save as much water as possible like most people. Water pressure can also damage the bricks themselves but a quality brick cleaner will have done the right preparation and know exactly how much pressure the bricks can withstand.
Sandblasting bricks clean is a good way to reduce risk of chemical reactions and stains with the bricks, but if sandblasting is not done properly your bricks can be scarred. Not all bricks can be sandblasted clean, including sanded, glazed or coated bricks. Sandblasting machines use different types of materials including silica sand, crushed granite and sometimes even nut shells.
As usual, if you need a quality brick cleaner simply post your job and we'll find one for you!