A hot and long cycle in the tumble dryer will kill any adult fleas on the items and will also kill any flea eggs that might be there too. It has to be hotter than 60ºC in order to kill fleas - This goes for the washing machine prior to the tumble dryer too!
If you are dealing with a flea infestation and need to remove fleas FAST, follow our quick and easy guide to get rid of fleas in a home and on a pet - Flea removal instructions here!