I have a problem with moss - more moss than grass - on the lawn esp after the wet August, and only now I have tried to aerate it with a spiky object.
Also, I put on a moss killer, the Westfield one, and yep, the moss turned black. I won't be doing that in a hurry as I think I went over the same strip a few times in the plastic wheel thing, it left a right pong for a week.
Anyway, you can't blame the product for leaving the lawn in the state it is, once I'd done my best to rake out the moss you can't quite tell where the black moss is and the earth.
On another thread someone mentioned pro mulch on the lawn for a week, then seed it. That was for starting from scratch though. Is there something I could put in the plastic wheely thing - a mix of sand and grass seed - that would help tart up this lawn before autumn sets in? I did try another Pet Friendly Westfield product a week ago, again using the wheely thing but have yet to see any real benefit...