I also agree with everyone else. I wouldn't go another step further without washing and drying your blocks.
NOTHING gets past my washing machine and dryer until it's washed and dried! I'm also careful when I iron, making sure not to push the iron on the diagonal, but keeping it in line with the grain when possible. It helps keep the fabric from stretching, and I no longer "iron", but rather "press" when my pieces are sewn together. It really does make a big difference in the finished block and requires much less trimming, if any at all.