For context, there are two stray dogs at our local city park that we can’t outright adopt, apartment rules say no pets, but we’ve been doing our best within our means to care for them at the park in the meantime.
More details here: https://lemmy.world/comment/11362479
Butter. Sap is not water soluble, so soap and water won’t work. It is, however, fat-soluble, so you must rub an oil (any pet-safe/food oil will work) into the fur and incorporate the two together. Then you can use soap and water to rinse out the mixture. Voila! Works like a charm on many hydrophobic substances.