Figs. 4 and 5 compare the standard finish samples with the finished after different plasma pre-treatments. In every histogram, representing a specific CPU, each block of bars refers to a specific ageing condition (given by a certain number of washing cycles); within a specific block, each bar represents the water (Fig. 4) or oil (Fig. 5) repellency grade of a selected plasma pre-treatment according to the specification given in Table 1.