Please dont just jump in a buy a machine. Go and see the carpex show next week or any of the others on offer, walk round ask questions see the demo's, you will then see it's not an easy job to clean and get right. Training is a must, if you don't know what your cleaning you could leave that customer, with no end of problems for them and you. Insurance, machine, tools, chems, spare parts sitting in your garage so you can fix the machine ASAP and not let the customers down, advertising etc the list goes on and on.
Look back at the past posts on this board, there will of been questions asked and answered, you may even see questions you never even thought of.
Hope this helps, may see you at carpex if you can manage to go.