I've got about a thousand (at least) sf of concrete driveways and walkways.
It is dyed very light red, like a faded rose.. The builder did a sloppy
job. They splattered some regular concrete mud here and there, and it
dried. Now I have regular concrete on top of dyed stuff. This concrete is
years old.

I went out there with a power washer and a wire brush and a scraper, and
knocked down some of the worst places. And I have a million curlie que
lines where the power washer washed. Still, some of the areas are gray with
the topical application of concrete. The wire brush didn't do anything.
The scraper knocked off the blobs, and helped the most. The power washer
blasted off what it could, but there's still lots of spots it wouldn't
remove.

Is there any way to generally clean the concrete? I would think I would
have to special treat the problem areas, but if I do that, won't they look
spotted and obviously altered like the power washer lines? Probably do two
or three applications, the first to the spots, the second in general.

I have grass bordering on one portion, so acid wouldn't be a good deal
unless I am very careful, or am just willing to sacrifice some grass.

What would you do?

Steve