I use a wet Qtip dipped in water. Swipe down the stitching line on the paper side and after a minute or so the paper under the seam will be soggy and pull apart. Generally when I paper piece, as I sew all the blocks tog I remove the paper from the seams. Then I remove the paper. from the blocks. I start at one side of the block and by the time I get the whole block done with the Qtip, the paper around the first seams are ready to be ripped off.