Panties, trash em or no? 😣

Hello sweets! 😍 Ok so i wear pads only. (Tampons hurt...) anyway, my period can be sooooo heavy some months & in the morning ill have an overflo. (Ive tried everything except a diaper! LOL LML) so- my QUESTION 4 u is:
How do i remove stain, can i, is there a trick?? I scrub & soak immediately... But no luck.. So i trash em. Friends  say i should keep em as my "period panties" but i cant, its not clean to me 👎 between this and my dogs stealing & ripping my draws apart, i buy a lot of panties... But never have more than a dozen available😂 help! 
Thanks