A variety of nontoxic substances are just as effective as chemicals without posing any danger to you or the environment.   You can choose to use diluted Hydrogen peroxide, undiluted vinegar, or baking soda paste.    How to clean the caulking compounds:   HYDROGEN PEROXIDE: Use a spray bottle to apply to the caulk until it is soaked. Let sit for at least 10 minutes before scrubbing with a sponge or a brush. Dry the caulking compounds when done. BAKING SODA: Add some spoons of water to baking soda and mix to obtain a thick paste. Apply the paste on the caulking compounds and let sit for 20 minutes. Scrub out. Rinse with water UNDILUTED VINEGAR: Generously spray the vinegar on the caulking compound Let sit for about one hour Scrub the caulking compound with a brush. Rinse the area with water.