There's nothing that will brighten up your bathroom faster than re-caulking an old, mildewed bathtub or shower. You will need a utility knife, bleach, a small bucket of water, a toothbrush, a tube of caulk, a clean rag, a silicon caulk remover, a plastic caulking tool, and painter's tape. Watch this video plumbing tutorial and learn how to re-caulk a bathtub or shower.