Yes, I am saying Simple Green will work as well as Castrol Super Clean without the negative effects. It doesn't dry out rubber or harm aluminum. Spray it on let it sit for a while and hose it off. If it is real bad scrubb a little and then hose it off. Sometimes you have to do it 2-3 times if really bad but, it is my prefered way of cleaning greasy/oily engines and engine compartments.