I've read on here you just need damp cloth to clean the casing/lid, but I've just tried the smallest amount on a cloth and also tried kitchen towel and the small streak I saw has now become the whole lid. It's just speckly/streaky and looks worse than before I started. Are these cases not up to much cleaning wise. It looks worse. What do you guys use and is it now ruined or can a stronger detergent bring it back to how it was, What do they use in stores as they always look decent despite the masses touching them. Also I'm gathering the grease marks on the touch pad is beyond help 8 months in? That won't budge with anything will it? Thanks..