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.
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
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.
A hamster cage should be cleaned weekly.
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.
Hamsters don't generally smell if their cages are cleaned regularly and properly.
A horses stall should be cleaned every day.
unless it is regularly cleaned and heated to 24degrees, no.
Not if it is cleaned regularly.