You are correct sgtt, that old Joy bottle has stood the test of time. But, it is begining to show it's age, and your comment on deterioration caused me to go look at the Polmolive bottle my wife has under the sink. It s very thin, hard, and perfectly clear. It is undoubtedly made frome the new bio-degradable plastic which will break down in 100,000 years, instead of the usual 1,000,000. The old Joy bottle is much thicker, kind of opaque, and much more pliable. You may have to go look in the soap section at the local market, and buy a brand that has the thickest jug. Then put some naptha in it, and store it in something that would catch a spill, until it proves it is up to the task. It just might be that the age of the Joy bottle means it is made from the old plastic which naptha doesn't act on, but it might eat the new plastic ? I'll be running the same experiment.