However, I faced resistance in the least expected place. I shop at Urtehuset in Kongens Lyngby, Denmark for most of my organic and health needs. They are a tiny shop with food, tea, cleaning, cosmetics, and supplement products. Since I'm a regular customer and am appreciative of the nature of a small business, I approached the counter to explain the project and ask permission to take some pictures. To my great surprise, the service lady said no.
Apparently there had been an incident in which a customer, who turned out to be a journalist, had come in and taken photos of products and the store employees. She later published a story deeply criticizing their products along with the photos she had taken. I tried to explain that this detergent investigation is highly likely to favor Urtehuset's selection, but to no avail -- they would not be allowing any more pictures. Luckily for me (and convenient for many), the big chain market Super Best now carries the Ecover detergent line; and there was no difficulty getting information there.