40W is okay, but pay attention to an easy to ignore the problem, do not think that the investment is the main equipment, in fact, you 40W, with 20W to buy the main equipment (washing machine, dryer, ironing machine), the rest of the boiler to be considered (2W), the rental of the plant decoration and then simple to floor tiles, wall tiles, drainage, water pipes ... ... (2W), pick-up and delivery of at least two vans (less simply can not, this industry all depends on the wheels of the diligent, 8W), auxiliary other equipment (trolleys, pumps, plastic drums, stacking table ......2W), the rest of the money, plant rent, working capital, industrial and commercial licenses, unforeseen expenditures and so on! That's pretty much it.
That said, not including the environmental assessment. If you are in a place where someone sued you, you have to carry out environmental assessment, you may need to get sewage treatment equipment, oh, that is not a few million dollars under the come.