I bought my sub tank mini a couple of weeks ago and it vaped great until I tried use the rta section. I'm new to rebuildables so I watched multiple YouTube videos and followed exactly. Tasted freaking horrible. It wasn't a burnt taste. I'm not sure if it was machine oil or not. It was just nasty. So I tried again. And Again. And Again. All horrible. So I gave up on the rta and put in an occ and it was still awful. I have tried 3 different occ coils and vaped for about a week now and it still has the same taste. I tried different juices too. I have completely taken down the entire tank and rta and soaked it in soap and water, soaked it in rubbing alcohol, and I even got a tooth brush and scrubbed with soap and water and cleaned it out with a cotton swab. I don't know what else to do. I don't even care about the rta anymore I just want a clean vape that doesn't taste like ..... Please help.