So far no issues, i watched YouTube videos where people swim with iphone 8 and they talk about water pressure that it should not exceed specific amount of water pressure. Does water pressure means how fast the water drops on iphones? Will the water from sink tap have same water pressure as in swimming? Will washing in water ruin quality of the outside material?
No issues at all. While you are at it, perhaps you can also give your 65 inch OLED TV a good clean too by dropping that in the swimming pool.