Polysaccharide derivatives for detergent compositions

A method of washing or treating a plastic surface, the method comprising:

• (a) contacting the plastic surface with a detergent composition that comprises an alpha-glucan derivative substituted with an organic group that comprises a carboxylic acid group, wherein the organic group is the only substitution group of the alpha-glucan derivative, wherein the degree of substitution (DoS) of the alpha-glucan derivative with the organic group is about 0.1 to about 3.0, wherein 100% of the glycosidic linkages of the alpha-glucan derivative are alpha-1,3 linkages, and wherein the alpha-glucan from which the alpha-glucan derivative was derived has a weight-average degree of polymerization (DPw) of at least about 50, and
• (b) removing all of, or a portion of, the detergent composition from the plastic surface;
• thereby washing or treating the plastic surface, wherein the washed/treated plastic surface has reduced filming, spotting, haze, or other deposition.