Are you kidding me! I've just been buying new ones....Dip the tip of an empty Swiffer Wetjet solution bottle into boiling water for about 10 seconds and the lid twists off (use a towel). Refill with your preferred cleaning solution at appropriate dilution! and re-cap.
Homemade Cleaning Solutions
homemade swiffer pad - use a sock! solution for wet swiffer: vinegar, h2O , and 2 drops dish soap