Caulking Can Generally Be Removed by Using Caulk Softener/Remover

Caulking can generally be removed by using caulk softener/remover, along with a utility and putty knife. Apply the softener/remover and allow it to soak into the existing caulking for a few hours. After the softener/remover has had time to soak into the caulk, score the existing caulking along the joint with a utility knife and carefully scrape it away with a putty knife. Ensure that the adjacent surfaces aren't scratched while using the utility and/or putty knife. Depending on what type of caulk is present, a heat gun may be required. A variable temperature heat gun with a low temperature setting under 300 degrees will work just fine. Keep the heat gun moving, working your way along the joint to soften the existing caulking. Then remove it by using a putty knife. Be cautious while operating the heat gun to prevent personal injury and to protect adjacent materials from damage caused by excessive heat. Once the existing caulking is removed from the joint, clean up the debris and vacuum the joint. Using a rag with rubbing alcohol or another appropriate solvent, scrub clean the surfaces adjacent to the joint. If mildew was present, you should apply a mildew remover to the joint to kill any lingering mildew spores. Rinse with warm water and then allow enough time for the surface to completely dry. Source: buildipedia.com