Mod Podge is découpage glue that acts as a varnish on surfaces and materials to seal the material and prevent water or air from getting inside. Mod Podge is easy to work with and has many uses. If Mod Podge gets onto fabric, however, it can be difficult to remove. However, there is one trick that should work to remove dried Mod Podge from all but the most delicate fabrics.
Place the fabric on a flat surface. Use a butter knife or a putty knife to scrape as much dried Mod Podge off of the fabric as possible. Work carefully, so that you do not damage the fabric under the glue. Work in small sections to peel the glue off of the fabric.
Place a small amount of petroleum jelly over any Mod Podge left on the fabric. Work the jelly into the fibres of the fabric with your hands. This will be messy, but it will break down the glue. Try not to get any jelly on clean areas of the fabric.
Place a few drops of dishwashing soap over the petroleum jelly. Work the soap into the jelly with your hands. You can also take two sides of the fabric and rub them together to create a lather.
Place the fabric in very hot water, either on the stove or in the washing machine. Push the fabric around with a long stick or hanger to rinse the soap and petroleum out of the fabric. Do not use a plastic hanger, since it may melt. A wood or metal stick is best. As the jelly is lifted out of the fabric fibres, the Mod Podge will come out with it. Repeat the process until the fabric is completely clean of all petroleum jelly and Mod Podge.