Protect contains d Limonene which is a natural alternative to toxic pesticides for pets with fleas. Because it does not contain any harsh chemicals, Protect is powerful enough to produce immediate results. Protect can also be used to deep clean greasy and exceptionally dirty pets without drying out the skin and coat or leaving a residue. Special conditioners add luster to coats without using and harsh additives. Protect rinses easily and leaves coats luxurious, healthy and shiny.