For best results use on washable fabric. Not recommended for dry clean only fabrics. Store pen with cap on and point facing downward. Always test marking pen on fabric you are using to be sure marks will completely disappear. Some fiber contents, fabric finishes or dyes (red and pink in particular) may not be suitable for se with this pen. Mark fabric lightly. Do not store marked projects for an extended period of time. To remove marks, rub gently with clean cloth well moistened with plain water. If marks reappear when fabric dries, repeat removal process.