"William Redding" wrote in message
...
I have to pressure clean my driveway. It is stained brown from years
of well water overflow.

I understand that using a water pressure machine and muriatic acid is
good for this type of cleaning.

How is the acid applied to the driveway and how much?

The first thing you should do is simply power wash it. There's a good
chance that will do it (rent a good power washer.) Muriatic acid will
actually etch the concrete, which you might or might not want to do.