Our company succsesfully removes graffiti from almost all kinds of surfaces. Of course from some highly absorbent surfaces we are not able to remove graffiti or tags 100%, with these materials the success rate is approximately 70%. In these cases if its possible we cover the remaining shadows from spraypaint with proper paint after removal.
For removal of graffiti from stone or concrete most effective method is sandblasting. We usually manage to remove grafffiti 90 to 100%. This method is also environmentally friendly because it does not require any chemicals. For other materials and surfacess we usually use graffiti removal chemicals and high-pressure water pistols.
To ensure 100% successful removal of graffiti in future we recommend antigraffiti coating.