TFR (we used to use G101 I think it was called) can be diluted depending on the job you want it to do. It's a very powerful degreaser if mixed 50:50 and will mark window rubbers (they then require dressing) at anything more than tfr20:80water.
I would say it's a solution I would wash a car with when you want to clean it of all contaminents before claying, including to some degree destorying surface wax protection, oh and don't use in strong sunlight.