hi there,
it all depends what state the property is in , you could be looking at anything from £100- £150, the £100 for three bed then increment up from there, this is for standard end of tenancy sparkle or refresh clean,. external windows, carpet cleaning all would be extra.
I am quoting one on sunday evening , i let you know, full clean, windows and carpets, so probably around £300 if they go for the whole lot.
we are looking at 100 properties to be cleaned in July, ave. cost is £100, when you do the maths, it creates an economy of scale. and therefore profit
regards
martin