John
You did not say what type of cleaning training that you require for your staff.
To certify cleaners they need to pass a test at the end of the training course.
Training should be built around H&S as to do many work tasks are often not too difficult but the important part is the safe systems of work.
For example if you do not train your employees in manual handling, it would be difficult to defend against should an employee make a injury claim.
Hope this helps
Steve Scotter