A very good and cheap way without unnecessary chemicals is steam cleaning. Even in ancient times, people used to clean their clothes with steam, and now the same procedure can be safely carried out using steam cleaner for mattresses
https://www.fortador-usa.com/blog/how-t ... attress-to -remove-urine-sweat-stains-dust-mites this procedure does not require much effort and knowledge, and I especially like the fact that the mattress dries quickly (it is better to put it outdoors after cleaning). Also, do not use chemicals that can damage tissue. I recommend.