Fake Blood on Scrim

Hi everyone.

I am doing special effects for "She Kills Monsters, YA Edition," by Qui Nguyen. Late in the show, a character pulls another character's heart out. I want to use shadowplay for this effect. However, I want fake blood to shoot on the scrim after the character removes their heart. My issue with this is that I don't want the scrim to get stained, and we use it directly after this event. Is there any fake blood (recipe) that can be washed out cleanly?

Example of effect I want to achieve. (TW, simulated blood)