It's funny, when I used to ride only to race or MTB recreationally I was very religious about lubing my chains. Now that I ride almost every day to commute/play, I'm really sloppy about chain maint.
Really, pick almost any decent lube of your choice and relube as it wears out. The new lube will flush some of the old gunk out so wipe that off. Done.
I only lube my chain nowadays to make it STFU, and they last a long long long time.