@alicehelpern, Alice, Posted some links below that explain how to remove latex paints from fabrics/polyester. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.
http://home.howstuffworks.com/how-to-remove-latex-paint-stains2.htm
http://www.wikihow.com/Remove-Latex-Paint-from-Clothes
http://www.howtocleanstuff.net/how-to-remove-paint-from-polyester-fabrics/