If you’re not used to using vinegar, you can use citric acid. Before use, dilute the acid in hot water: 75g of acid to 1/2 liter of water. You can also add essential oil here. Mix well and pour 100ml of the solution into the washing machine compartment before starting the wash.
Baking soda combined with Marseille soap

You can also mix 1 tablespoon of baking soda with 2 tablespoons of liquid soap (Marseille soap). Add the mixture to the detergent compartment and run the machine.

Salt has properties that allow it to eliminate unpleasant odors. You can then add it to the water and pour the solution into the washing machine before starting the cycle (10g of salt per 1 liter of water). Add your favorite essential oil to give towels and bathrobes a pleasant scent.
Lemon

Mixing 5 liters of water with 600 ml of lemon juice will give your laundry an indescribably fresh scent. Simply soak your towels in the mixture before adding them to the washing machine.

Choose this last tip for white laundry because lemon has lightening properties.