Method of manufacturing a device for surface sampling, wherein the device is configured for being fixed to a test surface, and for allowing washing/extracting liquid to be injected and extracted from the device while being fixed to the test surface, the device comprising: a flat material layer comprising a surface portion and a circumferential edge portion defining the boundary of the surface portion, further comprising a sampling volume, wherein the sampling volume is adapted to comprise a filler device for filling out the sampling volume, and a protective layer arranged on the surface portion of the material layer by an adhesive arranged on the material layer; the method being characterized in that a portion of the protective layer extends beyond the boundary of the surface portion for facilitating a removal of the protective layer from the material layer, and in that the method comprises the steps of: - feeding an elongated material layer, and a protective layer and latex sheet or thin elastomer film arranged on a respective side of the material layer, - forming a circumferential edge portion of the of the material layer by punching through the latex sheet or thin elastomer film and the material layer using a punch for forming a circumferential edge portion of the material layer, - forming a portion of the protective layer by punching through the protective layer using a further punch for forming a portion, whereby the punching, or at least part of the punching, is carried out outside the circumferential edge portion. a flat material layer comprising a surface portion and a circumferential edge portion defining the boundary of the surface portion, further comprising a sampling volume, wherein the sampling volume is adapted to comprise a filler device for filling out the sampling volume, and a protective layer arranged on the surface portion of the material layer by an adhesive arranged on the material layer; the method being characterized in that a portion of the protective layer extends beyond the boundary of the surface portion for facilitating a removal of the protective layer from the material layer, and in that the method comprises the steps of: - feeding an elongated material layer, and a protective layer and latex sheet or thin elastomer film arranged on a respective side of the material layer, - forming a circumferential edge portion of the of the material layer by punching through the latex sheet or thin elastomer film and the material layer using a punch for forming a circumferential edge portion of the material layer, - forming a portion of the protective layer by punching through the protective layer using a further punch for forming a portion, whereby the punching, or at least part of the punching, is carried out outside the circumferential edge portion. - feeding an elongated material layer, and a protective layer and latex sheet or thin elastomer film arranged on a respective side of the material layer, - forming a circumferential edge portion of the of the material layer by punching through the latex sheet or thin elastomer film and the material layer using a punch for forming a circumferential edge portion of the material layer, - forming a portion of the protective layer by punching through the protective layer using a further punch for forming a portion, whereby the punching, or at least part of the punching, is carried out outside the circumferential edge portion.