Replying to Disgusting stinky boot liners

i have had my fulltilt high fives for 2.5 seasons and they stink. i mean really smell bad. if I put my hand in to adjust the liner they make my hand smell bad. i cant even keep them in the back of my car without smelling them. i have tried to air them out for a week and also used laundry sheets to make them smell better but it just turns bad after one use. are there any other tricks to making them smell good or should i cut my losses and buy a new liner?