I need the TIP using liquid starch (or something) added to acrylic paint when

decorating holiday windows!? I want to paint some TEMPORARY holiday scenes on my windows using acrylic craft paints.
I seem to recall a TIP that makes the paints removal easier when the holiday is over. It called for adding "something like" liquid starch, dish soap, shaving cream or glycerin to the paint. It was a common household item of some sort. Does anyone know this mystery ingredient?
 
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