I vape mostly thin juice in CE4's, and it's mostly hassle free. I dry-burned a few after cleaning them out, and noticed how a blueberry/vanilla clearo now has this slightly burnt / silica taste. The coil wasn't even that gunky, but some residue did burn off. The gunkiest coil was from a blackberry VG based juice, but that 1 doesn't have a lingering bad taste, nor do any other clearo's I've cleaned. I don't clean them w/ alcohol or anything, just some solid rinsing w/ hot water and then full air-drying. Could it be an issue w/ vanilla flavors?