Help please with basic medal questions

[rjcook]

I want to attach a Bomber Command clasp to the 1939-45 Star. I don't know if the clasp is supposed to be sewn to only the top fold of the ribbon, or through both folds. Could someone enlighten me?

I have also a protocol question of sorts. I am framing the medals award to a man killed in action in 1944. The medals, awarded posthumously, have sat in the original cardboard mailing box that the Air Ministry sent to his wife in 1944. Should I clean these medals to their original state, or leave them tarnished? It seems to me that leaving them tarnished may be more of a sign of respect to the man awarded these medals who is not around to clean them himself. Thanks for any insights.