Once week works for most folks.
You should make sure that its in a clean place but you should clean it every few days
You should have it detailed at least once a year to keep it clean looking sharp. You can save money by doing it yourself though.
You should clean your Clarinet every time you play in it.
You should clean it everyday that you use it.
you should really clean your horses stall from 3-6 days of the week.
You should clean it
Clean it.
When you have a spa used by the public you want to drain it often. The water in the spa should always be clear and clean.
Once a month
once a week.
daily
Take a look at waterless car wash products. If you clean your car often, you could do it quite economically.