What does "metallic taste" mean to you. Yes it's important. Everybody has a different opinion of what they are tasting, even when things are going right. It could be that it needs cleaning, more juice, better vendor, bad batch, primer taste etc.
As for cleaning, I've never done anything but running under hot water for a minute or two. That works for ME, but there are DOZENS of people who do different things from the normal to downright bizarre.
On the mod front, I found (again just ME) that the spring mod is the best way to get a nice consistent flavor without the filler taste, burning taste, nasty taste that you get with other methods. Each person has their favorite, only experimentation can show you yours if you even want to mod. You don't NEED to as the stock methods work well when the instructions are followed. Most modding is done to do one of two main things, 1. save money 2. play
E-juice makes a world of difference. Even from the same source. Some do their job and others are like that lazy cousin everybody knows but nobody wants to talk about.
*side-note: Most importantly, don't get discouraged in the beginning, understand it's a hobby and a journey, like everything new it's going to take time to find your way around it. I tried just about everybody's tricks and opinions to find what works for me, and I'm still doing it. Fun as hell too.
I blow it out, and it makes for only a draw or 2 of off taste. As far as cleaning, a good espresso steamer works like a charm, and fast too
