The thesis covers the problematics and methods of removing subsequent coatings from wall paintings that were repainted in year 1958. I met more closely with the implementation of conservation and restoration interventions on paintings in the dome of the chapel of Škofja Loka castle, where I participated in regular work practice at the Academy of Fine Arts and Design of Ljubljana. Removal of secondary coatings and impurities in the years 2013 – 2015, was performed by a team of conservators-restorers of the Institute for the Protection of Cultural Heritage Restoration Centre Ljubljana under the direction of mag. Anita Kavčič Klančar. The project was carried out only in the dome, so in the course of the thesis I performed extensive testing of the methods for removing later deposits on the lower walls. The work required consistency in adapting solutions and thorough photocumentation. It is necessary to have a broad knowledge of the compatibiliy of used materials and taking into account the safety at work. Due to the influence of moisture in the carrier, mechanical, chemical and combined methods for removing subsequent deposits should be selected when performing conservation and restoration procedures.