I wear my S4 SBSS in the shower, every day, for more than 2.5 years now and occasionally I wipe it off with my t-shirt, nothing else. I do have some scratches in the glass that are only visible at certain angles. but the body is absolutely pristine, no marks whatsoever - and as you can tell by the scratches in the sapphire, I'm not really careful with the watch. But I do have AC+ 🙂