Put it in the drum instead of vinegar. Mold and coatings disappear, and the washing machine will smell wonderful!

Oils Make the Washing Machine Smell Better?
Adding essential oils is generally unnecessary.

Essential oils do not dissolve readily in water and can potentially leave oily residues on components or fabrics.

A clean washing machine should not need perfume to smell fresh.

If the machine smells bad, the better approach is to identify and remove the source of the odor rather than cover it with fragrance.

Why Does the Bad Smell Keep Coming Back?
If the smell returns shortly after cleaning, your washing habits may be contributing to the problem.