AutoDepth's Citrus All Purpose Cleaner is a powerful yet safe cleaner that can take on many cleaning jobs! It's a V.O.C compliant, non-caustic, non-acidic cleaner that can be used for engine bays, wheels, tires, wheel wells, exterior surfaces and diluted to use on interior surfaces. Directions: Engine bay, wheels, wheel wells & tires: 1. Spray onto surface. 2. Agitate. 3. Rinse or wipe with a microfiber towel. Pre-soak (Dilute 1:1): 1. For a safer wash, rinse vehicle, spray Citrus onto all surfaces (foam on top for longer dwell time). 2. After 3-5 minutes, rinse and proceed to contact wash. Interior: Dilute 1:5 for interior cleaning.