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hey Miro what about if you try to transmit the concept in a different way, for example if your customer is a restaurant, use the kitchen to get the attention is a bad idea, maybe you will try to get a pic that shows a delicious plate of food that people think, I have to taste that.. same thing here, why I could call these guys??? because I want to get my CARPET NICE AND CLEAN, I don't care how they will do it,
maybe you can use a beautiful woman seated on a nice clean carpet, a family enjoying time, a baby, etc...that option depends of your customer..
good luck :)

Thank you very much for the ideas! However, in this case I think that the client wants a cleaning woman. This is an open competition and the client has given best points to that kind of designs.