go to the Health and Safety web site where you will find guidelines. Unfortunately there is no Standard template as risk is multi variable.
My wife is a risk assessor but she she says the risk you are assessing is,
What potential risk YOU might present to the premises / fixtures / fittings / personnel while carrying out the task of cleaning .
So..................you identify any potential risk
Hoses, Wet surface, Skid risk when walking off carpet onto vinyl, chemicals being used, exhausting into the atmosphere, etc.
You say how you will overcome, or manage all of the identified risks and write it down
You WILL find templates by searching for risk assessment info which you can adopt