Another stroll down amnesia lane.
I remember touring the Netherlands Institute for Maritime and Underwater Archaeology many years ago and looking at their setup to use polyethylene glycol for preserving the raised wrecks of wooden boats. There were tanks under the floor to immerse pieces and also sprayers set up to apply the preservative to items laid out in the open.
I asked an older man who worked there about the preservative and he said he didn’t know….and showed me a card with a list of words that included polyethylene glycol; which was highlighted. He said that that was the preservative used and he explained the process for a bit. At one point he said that list was actually the ingredients in his heart medication….proof that it was good for old wrecks of any sort!