how to safely remove sticky residue from soft cases

[dmh]

I have a Pioneer case with some sticky residue on it and a gentle soap clean does nothing.

I thought this would have come up before but can't find anything in the forums.

Has anybody worked out what can be safely used to remove sticky residue from the soft cases without removing colour or damaging the case? I'm hoping someone has done this before so I don't risk damaging the case while experimenting.

The calculator is fine but the sticky case is annoying as I get it every time I pick it up and have to worry about how and where I put it down.

Ordering another case in Australia would be expensive and may not even ship currently.

TIA, dmh