I understand entirely, however as far as pricing guides are concerned, without taking measurements/seeing the density of the building/building type and use etc, any guide would be useless. Then of course you would have to take into account the prospective client's needs and wants into consideration, this really can only be done by visiting the client one's -self!
As far as telephone/computer cleaning, again this is a really difficult question to answer, let's take the telephones first.
Telephone Cleaning
Do you clean the handset only, the digit pad, the cord, the base and do you sanitise the handset?
The point is, how clean will count as clean in the eye's of your client?
As you can see, doing the handset only will be a lot quicker than doing all of the associated actions, therefore productivity would be high and the cost to your client low. Without actually knowing your prospective client's wishes, how can anyone give you a price guide to use?
Computer Cleaning
This one is more complex, do you remove dust and debris from the internal fans (CPU/PSU/CHIPSET/GRAPHICS CARD) if so this will mean removing screws from the case, expansion cards etc. This is very time consuming, not to mention very risky, unless you are properly trained and insured, imagine your client sueing you for loss of data if you damage a component, even if you did nothing wrong, computers do just give up, honest!
Do you mean just getting rid of dirt and grime from the casing?
Very quick and easy to do, what about the monitor/keyboard and mouse, how clean do these items need to be?
As a very rough guide, we have two people who clean only telephones and computers, a full computer clean normally costs £12:00 not including the keyboard, new keyboards can be purchased for about £10, this operation takes about 20 mnis per computer.
As for telephones for a full clean and sanitise we charge £3 per unit, each unit takes about 3min.
However, you must be guided by your client, regarding their own specific want's and needs, hope this helps, regards,
Rob