I have acquaintances who work for the local wastewater department. If they ever found out any of you were putting bacon grease down the drain, with or without detergent, with cold water or hot water or lukewarm water or no water at all, they would come to your house with picket signs.
Bacon grease, along with other fats that have cooked out of food, forms these huge greasebergs (like icebergs, only made of grease) in the sewer system and these poor folks have to get it all out because it can not only block up the house drain, it can block up an entire sewage plant.
Don’t put bacon fat down the drain! If you can’t bring yourself to use it in cooking (if you are going to cook Southern food it is essential) at least wrap it up in paper and put it in the trash. The Solid Waste folks can bury it in the landfill, where it will feed critters of various sorts until it breaks down.
Better yet, use it to make soap, or roll cold chunks in sunflower seeds and hang them in the trees for the cardinals and other over-wintering birds.