[That is not at all pleasant, but Kay gives him a kind, if slight and long-suffering, smile and just says-] No thank you, but that's very nice of ya. [ Then he motions him away from the sidewalk, more towards a patch of grass.]

Hey, if you come over here I'll go get you somethin' better than the candy. [And then he can call for the proper clean-up. He knows this isn't the only slimy alien around just... probably one of the more rancid ones.]