I would guess that depends what the odour comes from.
I made apple butter one time in 6th grade.
Spray the leather with frebreze
it is a physical change because no reaction occurs and there is no new substance. :)
Buy clean leather.
What might work for you is an APPLE CIDER VINEGAR mixture. Just mix equal parts ACV with warm water and spray directly onto scalp. The smell might be offensive, so be sure to work shampoo into the ends of your hair. Finish off with a cool water rinse. Note: this should only be done once a week, at most, as the vinegar can be harsh on your hair.
Vinegar is an acetic acid solution in What_are_the_ingredients_of_vinegar(5-9 %).For non-distilled vinegars (cider vinegar, wine vinegar, malt vinegar, balsamic vinegar, etc.), other compounds will be present; these are what give the vinegar its particular What_are_the_ingredients_of_vinegarand odor.
Removing the odor of fish oil from any surface is a tricky undertaking. If possible, put the item into the dishwasher or washing machine. If not, try soaking the surface in apple cider vinegar for several hours.
vinegar and water
physical
Lots of vinegar.
Try vinegar to clean hard wood floors. Vinegar has this substance that can remove stains, bacteria, and most especially bad odor. At first, you will smell the vinegar in the floor. But after an hour, all odor will be removed.
I have tried vinegar many times on urine soaked clothes, soaking in hot water and vinegar...smell is still there!!