Stephen,
You stated that you would first clean the tiles with a cream cleanser, then rinse, then bleach.
You already mentioned that you would bin the bleach when you are in a position to employ people, is your health less of a concern to you than your staff's?
There are more effective products on the market, perhaps not as cheap, but certainly less harmful that you should consider, and I do wonder what training course still uses bleach in its chemical armoury, in my own personal experience, no course has advocated the use of bleach for the last 10 yrs.
The cleaning procedure would also differ between walls and floors, the type of tile involved, the real colour of the grouting etc.
Also Art is quite correct, lots of insurance policies state clearly that bleach is not to be used.
Regards,
Rob