Being allergic to all the chemicals that were used in sanitary towels during the years when I needed them, I reverted to what my Danish grandmother, mother and aunt had used during the Second World War: knitted cotton towels of the yarn used for kettle holders, hand-towels, nappy pants and so on.
Far more comfortable than the disposable kind, and at need you could wear up to three at a time,(which being a stage performered was useful, as two towels could cope when a Tampax super-large called it quits while I was on stage DANCING!
Washing no problem, if the towels had been steeped in cold salt water, rinsed then put into a hot white wash cycle.
Concern for the enviroment ought to make re-usable sanitary protection and cloth nappies fashionable again. We at least do have washing-machines. My grandmothers did their washing in a wood or coal fired copper.