I recently found myself in a similar situation and can share my experience. I also have a building with a large number of windows, and maintaining them myself is simply impossible. I contacted window cleaning company Cody Building Services and was more than satisfied with the results. Above all, I was impressed by their organization: the team arrived exactly on time, quickly assessed the scope of the job, and got to work right away. I was very pleased with their use of modern equipment and safe, eco-friendly cleaning products, which ensure the glass sparkles and leaves no odors or streaks. Safety was also important to me, as we're working at height, and I had complete peace of mind—the team worked professionally, with full safety equipment and the necessary protective gear. Ultimately, the entire building was transformed: the windows are now perfectly clear, letting in maximum light.