In a recent tutorial video titled "Add Imperfections to your Architectural Renderings!" by Oliver Uszkurat from YouTube channel Upstairs, viewers are guided through the process of enhancing the realism of architectural renderings by adding textures, imperfections, and dirt using Photoshop.
https://www.cgarchitect.com/features/articles/1b719e03-add-imperfections-to-your-architectural-renderings