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 used:
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.
Pressurized 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.