Assuming the belt left some form of remains stuck to the inside of the dryer, you should do your best to scrub it off. You can use a strong deodorant or spray inside the dryer as well (one that doesn't burn and can work in high-temperature conditions). If there are no remains, then the burnt-smelling gas particles might simply need to be fanned out. You can leave the dryer open to air out the smell or use a fan.

Talk Doctor Online in Bissoy App