Apple cube cleaning

[jacob at dahl-pind.dk]

I got a Apple cube here as part of a larger haul, at some point someone 
placed a bit of tape on the clear polycarbonate case, the tape is long 
gone but the yellow glue remains.

Am unsure about the hardness of it, if I could use sugar cubes to 
rub it off, anyone knows a scratch free way to get it off ?

Regards

--
Jacob Dahl Pind | telefisk.org | fidonet 2:230/38.8