Hello, in my stampede 4x4 vxl Velineon 3500 Brushless Motor, i need to rebuild it, so i bought the kit, opened it up and there is a ton of sand and dirt in there, my first question is what do i use to clean that? I have wd40 and carb cleaner, thats it. My second question is i think my motor got broken up, there is metal pieces stuck to the magnet. Here is what the spindal looks like inside, as you can see there is big chips on it. Any help would be great. Thank you.