We are still finding blood splatter from when Rosie cut herself. Some of it wipes away with a wet paper towel, especially on gloss paint and porcelain. But on semigloss paint, you need to use a sponge with some rough surface, and do with the direction of the splatter.
If you are covering up a crime, I doubt this will fall the luminol test.
Hydrogen peroxide will help with cleaning blood but I doubt it'll pass the luminol test. Give it a try if you haven't already.
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