I have alot of dirt/grease from under the hood on the front of my car. I took it through the car wash but alot of it was still there so I figured Id get a bucket and try to wash it myself. First I used ArmorAll Carwash Concentrate and a microfiber towel and started scrubing but it didnt really come off. Then I tried Cherry Power Carwash and a sponge and that didnt help either. Any suggestions please?