The annual Golden Wiper competition pits Arthur’s aunt Rita, the two-time defending champion, against the ruthless Cosmo Peterson, owner of "Squirt o’ Sun." Desperate to win, Cosmo ignores the fact that his product causes hair loss—instead buying wig factories to profit from the side effect. The final challenge is to clean one side of Peterson Tower. Cosmo attempts to cheat by entering a "two-man" team with arms in plaster to appear disadvantaged, only for them to reveal healthy limbs once they reach the top. However, his plan backfires; "Squirt o’ Sun" leaves greasy streaks on the glass, possibly due to interference from Pigeon Boy. Despite Cosmo’s dirty tactics, Rita’s skill prevails. She claims her third consecutive trophy, and the public rejects Cosmo’s flawed product in favor of Rita’s own brand.