Not a good idea at all! Liquid fabric softner is intended for use in the washing cycle. It works to remove any remaining detergent left in the clothes that, if left in, causes the stiffness. Too work properly, the fabric softner must also be rinsed out. By putting it in the dryer can cause stains on clothes Your laundry may smell great, but you are actually harming your clothes and possibly your dryer with this practice. ... View related article.