Sansodor is much like regular mineral spirits, but smells much less potent. Plus, it doesn't deteriorate in storage like turpentine. So you can keep it around for a while and use as needed.
Just let the Sansodor soak in a bit from the garment wrong side (the stuff won't soak through the plastic-y top of the heat transfer) and let the solvent do its thing on the adhesive. It's best to let it sit for a few minutes.
Then just peeeeeeel the past affiliation away! Toss the allegiance-less garment in the washing machine. Because it doesn't have as strong of vapors ("sans odor," get it?), the odor will be washed out and not transferred to the rest of the laundry.
Sansodor also does cool things with colored pencil drawings. Making them look like watercolor. But this stuff isn't for kids to use. Just sayin'
Just thought you might need to know!