Best way to clean a wheel, tooth brush and then brush in running water, tire is one of those big scrub things that look like an iron with stiff Nylon bristles) soaking in simple green helps. Getting out wheel bearings, like in an electric truck? I just use one of my allen drivers and give a slight tap on the driver with my hand, when it is against the bearingspushing it out. n elctric parts cleaner works well for cleaning these, or you can pull teh shield off and use nitro clean or electric motor cleaner, I have heard of relubing with motor oil, but I would think a dry lbe would be better, like maybe graphite or something. The best way to clean it, depending upon what you are cleaning, is start with a tooth brush (probably the most easily accesable and adept cleaning tool you can own)and brush all the big stuff off, then use diluted simple green to get off the stubborn dirt, then WD40 to polish the carbon/plastic chassis, or if it is aluminum you are done after the simple green. Mind your electrics, the servos are not effected as much, but receivers and speed controls are. If you want to get down and dirty tear it down and clean everything, great for learning your truck better, and a good habit to get into.