Preventive anti-graffiti treatment can be a suitable solution for protecting the lower parts of structures in some cases. Some of the products used may change the visual appearance. A preliminary test on the substrate is preferable. A product such as Silreca sacrificial from Reca or Protectosil WS 405 from Evonik Industries can be considered. The duration of protection of the work with this type of product may vary over time depending on the environment and the type of product used. Cleaning solutions exist (high pressure sand/water spraying, cleaning with chemical solvents). The study of these solutions is to be seen with a specialised company.