I found this plastic cleaner by Plaskolite at Ace Hardware:
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Cheap and works well on acrylic. I later found that Plaskolite is a big acrylic supplier so that makes sense. It's also available on Amazon for a lot less than other cleaners that specifically claim to work on acrylic.
This took the smoky haze caused by cutting wood with insufficient fume extraction (during my earliest test runs) right off my lid window.