I clean any topper simply when I feel like a change of juice. 99.9% ISO Alcohol, Q Tips and paper towels are all I use. I buy the alcohol in 1 litre bottles and just fill a 10ml dropper bottle so I can drip it where I like. After a quick wipe, leave a couple of minutes for it all to evaporate and dry burn to be sure. I keep it as simple as possible, taking around 5 minutes for a wick change and clean.