7 g of paste detergent were used in the evaluation reflectance values of the swatches were measured on a gardner colorimeter before and after the wash and the data were analyzed using the kubelka munk equation effect of polymer solution viscosity and anionic nonhydrolyzable comonomer content on cleaning performance table 4______________________________________viscosity mole cleaning performancefilm cps comonomer soil removal______________________________________c 14 3 4 90e 30 3 4 87a 6 3 4 92h 5 0 90i 13 0 80______________________________________ it is beneficial for film strength reasons to have as high a molecular weight viscosity as possible high molecular weight films of the prior art however result in poor clay soil performance a 13 cp prior art film yielded a 10 decrease in cleaning performance over a 5 cp prior art film the films of the present invention however show only slight decreases in cleaning performance as viscosity is increased from 6 film a to 14 film d and 30 cp film e and the difference in strength between films d and e is insignificant the increase in viscosity between prior art films h and i resulted in a significant decrease in cleaning performance table 5______________________________________ solubility film residue after 300 sec 40 u00b0 f water 70 u00b0 f boratefilm residue residue______________________________________b anionic 0 0b neutral 50 25c anionic 0 0c neutral 50 25d anionic 0 0d neutral 100 100______________________________________ table 5 shows the neutral copolymer films e g with the comonomer in lactone form do not dissolve completely in cold or borate containing water when the films are in anionic form.