As long as its not a toddler leaving the wet mess....But then again: it's hard to insert a cleaner down the hole when your hands are both occupied with holding the toddler!!
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There are also some blends that are natural moisturisers too, though. I had some 7 Seas Royal last Sunday in a pipe with a balsa filter and it did leave a wet mess in the chamber: 9 hours after the smoke, when I emptied the dottle to clean it, the heel was all wet—not moist: wet.