As mentioned above, a sugar cube is about the safest way to do it...on metallics at least. My SE T610 had an Orange logo at the base of the front fascia and it 'sanded' off and wiped clean without a blemish right before my eyes
The nail varnish is a better bet for the rear logo though I would guess, but never tried it. Maybe you could try Vodka instead of nail varnish remover?