Yep, I did this earlier. I soaked it for about 20 minutes and initially used my finger to start the removal process. Then, I switched to a wet, soapy duster, and now it looks as good as new. It's amazing and didn't cost a thing.If you get all the built up grime out only scratches need attention, just soak it in fairy liquid long enough to loosen everything, then use a toothbrush if a nail brush is too course. Any left over scratches use a black perm marker and I normally follow with black plastic car polish…but make sure you wipe off all the residue with a lint free cloth. Done a few Naim cases like this, they come up great!