You've got to be serious about PE. I've never really bought that people can get a real workout in while bathing.
I really hope you don't take offense - I'm not suggesting that you're misguided or incompetent. However, I do think that you should put aside ~30 minutes every other day for PE alone. Do 5 minutes of good warmup (rice-sock, hot bath, infrared lamp), 5 minutes of stretching, 5 minutes dry-jelqing (slow, and steady [half-length strokes]), 10 minutes of consistent wet-jelqing (good form and a steady stroke is key!), and a 5 minute warm-down.
If you follow the above routine every other day, and you do a solid kegel routine every day, you should see results in a few months. After that, you can experiment with more intense techniques. I believe that the best gains come from the above workout. Consistency is the key! Let me stress that once more - CONSISTENCY IS THE KEY!!