I wouldn't melt it myself, mainly because it's a hybrid wax. Most waxes require a specific cooling routine to get the correct texture and consistency too. Certainly don't microwave it, hot solvents in a confined space is likely to end badly!
A hot, dry spoon or knife should do the trick though. The best way would be when you next plan to use it, scrape it out and re-mould it with your hands using the excess on the car when you're done (thus no wastage).