Anyone use a pre-shave oil before using a straight? I stopped using it and got rid of the bottle I had because it seemed to gunk up my brush when I lathered up. I'm just wondering if it would help or hinder a straight shave. I just ordered my first straight and I'm excited to get going with it. Will the oil affect the shave, or the sharpness of the blade? Might sound dumb to some of you veteran shavers, but I think it's a valid question. Thanks in advance for responses.