What should I do if rubber slippers smell?

Soak in boiling water, salt water or white vinegar, and the smell will disappear after drying.

Or buy some activated carbon and put it in your shoes to absorb the odor, and then take it out in a few days.

Be careful not to scrub with 84 disinfectant. Disinfectant will react with the plastic components of slippers, and the chlorine gas emitted is not only unpleasant but also toxic.