Need help cleaning and optimizing my computer system

I'm looking for someone to give my desktop a thorough clean and optimization. The task includes physically dusting the computer, cables, and peripherals, removing temporary files, defragmenting or optimizing drives, updating essential software, and ensuring startup performance is streamlined. I’d also appreciate a quick audit for any unnecessary programs and suggestions to improve speed and security. Please confirm you have experience with Windows and/or macOS, and let me know any preparation I should do beforehand. I’d prefer a morning slot and can accommodate a session of about 2 to 3 hours, depending on what you find.