Gently clean with a soft cloth and a leather cleaning product. Always apply a caring balm or grease after cleaning. If the collar becomes muddy, then clean with a damp soft cloth and allow to dry naturally, stay away from direct heat.
Hand wash separately in warm soapy water, allow to dry naturally, keep away from direct heat.
Brush Loose dirt off outer wax coating. Was down with clean cold water and hang to dry at normal room temperature. DO NOT DRY CLEAN.