They vary,
But briefly
clear litter first - You will be amazed at what you will find - normal rubbish, lost items coats, bra's, knickers, swimsuits its amazing what gets left behind.
Oh its a good idea to wear gloves!
Vacuum up - to collect hairs & debris
Then mop through. Obviously that's very basic.
The layout will also depend on how you will clean and what you use. If you are directly next t the swimming pools use a wet vac for safety.
Are you cleaning the actual lockers? if so some are basic metal, some are posh and wooden.
Then there is the general dusting of areas.
Will you be cleaning the showers and Saunas? Thats a little different and you have to use a chemical to wash away the body fats and hold back the mould in the showers especially in the non vented areas. It can get fairly hot. If you are cleaning these let me know - we clean plenty of leisure centres.
You may also be under a points system as well.
Are you not subbing this one?
Dave