[dreamtheater]

APC at 1:5 ratio and a magic sponge. Just do the area that's affected.

 

[dreamtheater]

Is there any particular brand of APC that's recommended? I had another go with Elbow Grease and a small scrubbing brush and it seems to have reduced slightly in appearance, just wondering if perhaps there's something better available.

Magic sponges[erasers] - are these all the same or should I be looking for any brand in particular?

The only APC I use is BH Surfex HD, I am sure other APC's will work. I used cheap Magix Sponges from B&M Bargains and they worked fine.