Graffiti is for some people a legitimate means of expression, for others a scourge to be wiped out in many Swiss towns and cities. But there are a few people who profit from the mess, cleaning it up in exchange for a regular paycheck. Philipp Zurbriggen (left), Terje Isler und Piero Ranieri erase the souvenirs left by spray painters. Pictures and text: Christoph Balsiger, swissinfo
All the windows within reach have to be protected before cleaning can begin.
An environmentally friendly substance, which softens the graffiti paint, is smeared over the marks.
Graffiti can be removed from any wall, be it concrete or sandstone, without causing any damage.
High pressure hot water is used to to complete the removal process.
The process removes virtually all traces of graffiti.
Occasionally, a quick wipe is all it takes to clean up.
A day later, the wall has dried and can be painted over. A protective layer stops colours seeping into the brickwork.
New graffiti will have a short lifespan. All it takes now is some hot water to get them off.