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I got this tip from an acquaintance of mine, who is the wife of a long-time washing machine repairman (he is now retired, but still helps everyone who needs him).
The best review, however, is that their washing machine has been running like clockwork for over 20 years, no mold, no odor and no limescale.
Try it; I do it regularly and although others praise vinegar, this has worked better for me. And I must add that it’s really only necessary now and then. I clean it this way about once every 2-3 months.
Quick removal of limescale from the heating element

If you want to remove limescale deposits, the simplest solution is to use plain citric acid.
Pour 100-200 g of citric acid into the detergent dispenser and run a washing program at 60 degrees. This is a completely simple way to clean the washing machine and remove limescale from all the important components inside the machine. Mainly the drum and the heating element.
Clean the detergent dispenser

After a while the dispenser always gets clogged and mold can even appear. The procedure is simple – remove the dispenser, dip a sponge or brush into clean water, then into citric acid and with the paste that forms just clean the dispenser, rinse and that’s it.
Clean the rubber gasket of the washing machine

Mix half a liter of water with 1 tablespoon of citric acid. Dip a cloth into the solution and thoroughly clean the gasket, including from the inside. Dirt, residue and mold spores will disappear.