Wash a garment stained with Modpodge in very hot water with soap. This will get the bulk of the glue out if it has not already dried. Then launder it quickly. Modpodge is sold by Plaid, whose website states it is easy to remove with soap and water.
Pick off as much Modpodge as you can if it has dried on the fabric. Use a spatula to smear petroleum jelly on the garment. This will loosen the glue. Then hand-wash the area with the hottest water the fabric can tolerate and a drop or two of liquid dish soap. Continue to suds up and rinse until the stain is removed.
Apply wallpaper paste remover to the stain. This is a last-ditch effort and will not work on silk, satin and fine fabrics. It should also not be used on wool, cashmere and knits, except for polyester knits. Wallpaper paste remover softens up the paste so the sheets of paper can be removed.
Put a piece of paper on top of the stain. Turn the garment inside out and apply the remover to the back of the stain. Work it in a bit and wait five minutes. Pull the paper off the opposite side to remove the Modpodge. Rinse the garment in warm water and launder.
Clean up the entire area as well as your hands with soap and water. When working with Modpodge, always make sure a cloth and warm water are nearby to clean up spills. Work on a level surface and wear an apron or old clothes so you don't have to fuss about stains.