microbial colonies in bathroom drains pathogens, close-up of a dirty, corroded toilet with yellow stains and grime, depicting

toilet contamination bacteria microbe colony pathogen drain fungus mildew hygiene sanitation odor floor neglect filth stain technique toxin old closeup residue fixture surface design waste dirty habit safety measure nursing system cleanup treatment water grime outbreak plaque biofilm care close microbial colonies bathroom drains pathogens corroded yellow stains depicting uncleanliness restroom generative ai