Zevachim 11:3-4

Zevachim 11:3

If the blood of a sin offering spurts from the animal’s neck onto a garment, it doesn’t require washing. If it splashed from the horns or the base of the altar, it doesn’t require washing. If it was spilled onto the ground and collected, it doesn’t require washing. Only blood that was collected in a Temple vessel and is fit for sprinkling requires washing. If the blood splashed onto the animal’s skin before it was removed, it doesn’t require washing; after the skin was removed, it does require washing – this is the opinion of Rabbi Yehuda. Rabbi Eliezer says that it doesn’t require washing even after the animal’s skin has been removed. Only the place of the blood must be washed (as opposed to the whole garment), and only things that are susceptible to ritual uncleanness and fit to be washed.

Zevachim 11:4

If the blood of a sin offering splashed onto a garment, a sack or a hide, it must be washed in a holy place (i.e., the Temple courtyard), an earthenware vessel in which a sin offering was cooked must be broken in a holy place, and a brass vessel must be scoured and rinsed in a holy place. Sin offerings are more stringent in this matter than other kodshei kodashim.