[Uwah, Kei is very distracted by touching mystical bullshit time controlling turn tables. He examines them pretty thoroughly without disturbing anything beyond moving them closer so they float near him.]

It seems like there's no reason you shouldn't be able to turn the clothes back to 'before they were stained'. Assuming these clothes technically existed before arriving here, or that point in time isn't blocked off from you by whatever keeps us here.

If there is still blood on them, though would that qualify as 'space' to need to remove it?