What are the challenges of polishing the interior surfaces of granite outdoor trash cans?

Polishing the interior surfaces of granite outdoor trash cans presents several significant challenges that complicate maintenance efforts. The primary difficulty lies in the granite's porous nature, which readily absorbs liquids and stains from discarded items like food, beverages, and chemicals. These absorbed substances create deep-set discoloration that standard cleaning methods cannot remove. Additionally, the confined interior space restricts movement and makes thorough polishing physically demanding, often requiring specialized equipment with extended handles and adjustable heads. Bacterial growth and odor retention further complicate the process, as microorganisms penetrate the stone's microscopic pores. Environmental factors like temperature fluctuations and UV exposure can degrade polishing compounds before they achieve desired results. Vandalism marks including paint, glue, or scratches require aggressive treatments that might damage the granite's finish. The substantial weight of granite units makes repositioning for better access impractical, forcing workers to perform awkward overhead polishing. Furthermore, food residue and organic matter create slick surfaces that pose safety hazards during maintenance. Professional restoration often becomes necessary when improper cleaning techniques etch or cloud the granite surface, diminishing both aesthetic appeal and protective properties.