Hey guys. I am really sorry this is a stupid question, but I have never seen it before so I have to ask. I went to flush out my radiator (just as periodic maintenance) and there is all this white, pasty stuff on all the surfaces in there. It is gritty and looks kinda like plumbing putty. I really don't think it is suppsed to be there, but I thought I would ask. And if it is bad, how do I get rid of it? I am trying the "radiator flush stuff" you put in with water and drive with for 3-6 hours, but I don't know if that's enough. Thanks as always.