Bizzie Lizzie
Please tell us you haven't agreed to clean computers and keyboards on your sites?! This doesn't normally get scheduled with office cleaning as it is a specialised add on. The only thing you should possibly be doing with these is dusting the top and stand of the screen unit with a lambs wool!
If you are going into office cleaning you need to decide the services you will be supplying, for general cleaning products you should get yourself a supplier who can supply you with everything, chemicals, mopping systems, cloths etc it is much easier to take one delivery in the early days. I use Dysys chemicals and find their chemicals exteremly good, their web site isn't brill but take a look
http://www.dysys.co.uk/You could also give express a ring, they will advise you and supply.
Fox