His dick has a smell 😬

It's not an odor exactly, but it is slightly unpleasant. It smells kind of like sweat mixed with cum. He's uncircumcised so I'm wondering if it could be from that stuff getting stuck under there and staying all day. He washes it every day though, but usually we do things before he's taken a shower that day (he showers at night). Do any of you experience this and how do you deal?