secure them with a rubber band, you now have a great tool for scrubbing pots and pans. you can also string a thin rope or shoelace through the top of these bags to make an easy closing tote for carrying items to the beach or small sports equipment to the field. also try to take empty ones to the farmer's market to use for new produce you buy.
once your dish liquid is gone, fill the bottle with vinegar to use for cleaning jobs around the house. i especially like this use for cleaning glass shower doors, as it's easier than lugging a jumbo bottle of vinegar around. squirt bottles also 