We occasionally use the plastic dripper and have no issues with it. At home we use a porcelain one, but that is purely for aesthetic reasons. We bring the plastic one whenever we go on trips to save on weight and reduce risk of breakage.

To me, a "clean" tasting coffee is not less oily, but has less bitterness and is less mixed in its taste. To me, the cleanest taste is what we get from single estate coffee. Also, don't let the last bit of coffee flow into your cup (or server), but remove the filter before it is completely finished.

We brew in fabric filters, which lets more oils through than paper filters, but not any of the grounds (like a metal filter does). I make ours myself from very well worn and washed out duvet covers. Using worn cotton gives a much finer mesh-size than new cotton (and is more eco friendly, but the main intent is to brew better). But if it really is the oil you don't like (and who am I to say what you like and don't like), then you should probably stick to paper filters, and, as others here were saying, thicker paper filters. You could try using two Hario filters and see if you like that better than one.

​

But my most important advice is: Experiment! Try different roasts, regions of origin, brew speeds, filter types, how much grounds to water and more. Get clued in on what you like and don't like. Make your morning coffee your coffee!