The basics Otter Wax All Natural Concentrated Castile Soap Canvas Cleaner for gently cleaning both untreated and waxed canvas. The benefits This concentrated castile soap is the perfect solution for those who have been wondering how to clean their waxed canvas items. The uses This specially formulated soap is derived from all-natural plant oils, to gently lift away dirt and grime, while not disturbing the waxed canvas. The bottom line The result is a great, deep cleaning foam that attacks built up dirt, dust, and grime, while not damaging your waxed item.