residue

Hey all. I know this is a toyota forum but coolant is coolant to some degree... Went to look at a 60k mile 2009 f150 with my Father in law. 5.4 v8 gasser. Former utility fleet vehicle for the electric company. Pretty sure this motor is specd for motorcraft gold coolant. Looks like a great...

Ripping out the flooring in the FJ45 and there is a ton of residue left behind. What would be a good way to strip all of this away? I was not planning to repaint the entire truck…if I can clean the floor and then repaint it with tinted bed liner….it would be a simpler job for sure….

1977 w/disc brakes. The left side is leaking a black residue mostly onto the inner side of the wheel. I'm guessing the knuckle is leaking and need a rebuild seal kit with bearing. Possibly ball joints. Am I thinking correctly ?