Smoke Smell on Rubber?

I bought a collapsible grocery cart over the i-net. The cart was fine except that it smelled terribly of smoke from having been in or near a fire. The odor is impregnated in the soft rubber handle guard and in the rubber tires. I tried the homemade solutions suggested by your member who had smoke odor in "memory foam", but neither the lemon and soda solution, nor the peroxide and soda solution worked. Can anyone help?