There's probably something better out now but I did some deep research a few years ago and settled on Optimum No Rinse for washes and Optimum Opti-Seal Sealant. The two products changed my life when it comes to car wash maintenance. Obviously, if you need paint correction, you'll need and additional product(s), but for washing and sealing, these two are hard to beat in my opinion. I spray the sealant on after washing and then wife off with a microfiber. No mess, no streaking, no hassle. Easy to buy on Amazon.
At some point I'll probably try their ceramic products but I really haven't had a reason to use anything else.