Does it have the option of different spray heads or is it just a pencil spray. If it is just pencil spray you could be there some time and the off the shelf ones - priced around £80.00 are disposable, not made for repair, what sort of condition is it in - do you feel that it is up to the job. If I was cleaning a house I would not use one of these.
I am not knocking it but can you not hire a petrol machine from HSS or someone similar and have the option of more pressure, fan spray and possible detergent pick up. A house with a decent machine should take half a day, so you hire for one day and add the hire cost to the end price.
You have a machine you know will do the job and the customer gets a good end product
Rob
