Depending on how often you are wearing your watch should determine how often you should clean it although most watches will function fine without regular cleaning.
The inside of your dishwasher should be cleaned regularly.
Gravel in a fish tank should be cleaned regularly, ideally once a month, to remove waste and debris that can harm the fish and affect water quality.
There is no book in the Heroes of Olympus series that is about "a young hero who cleaned his volcanoes regularly on asteroid".
All dog breeds with long floppy earflaps should have their ears cleaned regularly, as they are prone to infection.
A tuba should be cleaned regularly, ideally after every use, to maintain its optimal performance and longevity. Regular cleaning helps prevent build-up of dirt and debris, which can affect the instrument's sound quality and overall condition.
Thrush is the disease most commonly found in shod horses living in a moist environment when their hooves are not cleaned regularly. usually thrush or abuses
Providing it's healed from the initial piercing and it's cleaned regularly there is no need to remove it. However it may be more comfortable to remove it as blowing your nose regularly may make it sore.
A hamster cage should be cleaned weekly.
A feral cat shelter should be cleaned out regularly to maintain a healthy environment for the cats. Ideally, it should be cleaned weekly, with spot cleaning done daily to remove waste and food debris. Regular cleaning helps prevent the spread of disease and keeps the shelter comfortable for the cats. Additionally, thorough cleaning should be done between different groups of cats to minimize the risk of cross-contamination.
Hamsters don't generally smell if their cages are cleaned regularly and properly.
Knives must be maintained to keep them sharp and in good working order. Stainless Steel knives should be cleaned regularly and dried off immediately after washing.
In order to have your watch cleaned, you should take the watch to a professional. Watches have many moving and complicated parts, which is why even jewelers are reluctant to work with brands which they are not familiar with.