Sunlight yeah but that is the whole stick. Find where they are hiding in the day but oh they tend to be somewhere where its impossible to get sunlight to it. Otherwise they are like homelander. why garlic to in the thought. its like a minor aversion usually. Holy water for the fiction that uses that is generally a bigger deal and of course the whole wooden stake, bow and arrow is useful but it hard to be super accurate with that when a thing is zipping around like the flash.