Acid for brick cleaning Our team at Feel the pressure UK use a specially formulated, (gelled) hydrofluoric-acid based brick cleaning solution that is supplied to us by one of the UK's leading manufactures of high-performance masonry cleaning chemicals which has been designed purely for the removal of heavy soiling on old bricks that is often caused by airborne traffic film and fumes. The hydrofluoric acid based brick cleaner is applied to the brickwork using a stiff brush that is made from a material suited to withstand the application of such acids, the brush's we tend to use when applying acid for brick cleaning are made from natural coconut fibres as we find these are not only durable to withstand the acid but the coco fibres also tend to hold the application well, meaning there will be less drips, making the application process safer around.