PCs could make extra coin by ransacking monster corpses for cleaning supply components.There could be an entire secondary market in special monster materials just for cleaning services. Like, the only thing that gets ooze residue out of robes is shrieker vinegar, and for mummy ichor the best solution is soaking in diluted wyvern venom.
That's practically a class feature (for Druids & Rangers) in Level Up.PCs could make extra coin by ransacking monster corpses for cleaning supply components.