I have had it soaked in 91% ISO for 24 hours and there is still oil covering the wick and the bottom of the cup. Can I scrub the inside of the cart with a Q-tip? The manual says not to let metal touch the coil, so I'm assuming a q-tip would be OK... After I am done soaking, I remove it from the iso, rinse with warm water, let dry... Will there still be iso trapped inside of the oil that didn't clean off? or will the iso evaporate out of any oils that don't clean off? Thanks!