When I found the gum, I didn't want to put a chemical in my dryer, nor did I want to scrape it with a knife and an ice cube. Here is how I got gum out of my dryer fast.
I had saved a couple of those plastic fishnet bottle or candle covers (open at both ends) in my junk drawer. I took a rubber band and sealed off one end of the plastic cover. I filled it with ice and sealed off the other end with another rubber band. I scrubbed using the ice bag as a sponge and followed with a dry rag. It made quick work of getting the gum out of the dryer.