Every time you use it. Food carries bacteria that will multiply if not cleaned off every time.
4
The best way to sanitize a cutting board after cutting raw meat is to rinse immediately after cutting the meat on the board. Afterwards use hydrogen peroxide to disinfect the board.
You should make sure that its in a clean place but you should clean it every few days
You should clean it everyday that you use it.
You should clean your Clarinet every time you play in it.
you should really clean your horses stall from 3-6 days of the week.
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 week.
daily
Once a month
There is no requirement that they ever do it. The body keeps itself clean.
twice every month.