Use cold water for your paste and ensure the meat tenderizer’s consistency is uniform but not runny. Work the paste into the stains and let it sit for 15 to 30 minutes.
Then take a bowl of water and a sponge or rag to rinse the concoction as thoroughly as possible. Afterward, air dry the wet spots thoroughly, perhaps with a fan blowing on them.
Meat tenderizer is designed to break down the tougher fibers of the meat. When you put it on blood stains, the enzyme does the same thing, making it easy to clean