Ok, Ive been neglecting my baby here for quite some time due to a shortage in funds here lately. The other day I was lookin in my engine bay cuz I know I have a water leak somewhere up front. So I peek into the overflow bottle just to see how low it is or how much Ive lost, and my coolant is pretty much black. In the radiator, its much more green, but if I poke my finger down a little bit and drag it up the side, there is this nast black (maybe dark brown) sludge that comes up. Now I know I have to flush my system, But what is this **** and how do I get it out?? I dont think its gonna be like I just run some water thru it and its gone... And then what do I do with the coolant thats in it now? I know you usually take it to a local service place and they will dispose of it, but will they take it if its all black and stuff??