Acetone does not “melt plastic”. Acetone dissolves or is dissolved by many plastics, but hardly all of them. All you have to do is choose a plastic which does not dissolve with acetone.
Many plastics dissolve in water, too, but plastic water bottles still exist because even more plastics do *not* dissolve in water.
There are a huge number of different plastics out there with different physical and chemical properties.
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