SOS stripping

I just started using naturally natures charcoal bamboo inserts, and they seem to be the ONLY things giving me leaks. So, I tested it by pouring some water on it and it immediately beat it up even when I applied pressure. They won't absorb much pee at all so I'm assuming that I need to strip them. Does anyone know how to strip these? I can't find any info on how to strip the specific inserts😭