Sorry, so boring but ds has a fairly new top and it's accidentally been washed with a sticker on it (it was an entrance sticker to somewhere I think). Although the sticker isn't there any more, there's a load of sticky, sticker shaped residue on the top - is there any way of getting it off or should I just chuck the top? It's been washed about 3 times so far so clearly the machine alone isn't going to get it out. TIA and sorry for the tedium of the subject!