The purpose of this guide is to present information on the equipment needed and the methods that can be used when cleaning contaminated insulators. The methods or equipment, or both, presented in this guide are not intended to prescribe specific procedures, but to present the successful experience of many individuals who have safely cleaned contaminated insulators. The guide is intended to serve as a reference source for a company, or persons, seeking information on insulator cleaning procedures so that they may consider the experience of others in modifying or formulating insulator cleaning programs and practices.