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How to remove mold from your humidor

By Gary Korb

mold in humidorI've always been proud of the fact that I keep my humidors in tip-top condition. After all, as a "professional cigar smoker" I'm expected to know how to do all this stuff. Well, sometimes Life gives you lemons, and about a month ago I discovered that one of my boxes had developed a minor case of mold. This really caught me off-guard, because until then, I never had to deal with this problem.

As is usually the case, I discovered it by accident. I was reaching into one of my humidors to remove the humidifier when I saw some greenish-grey-looking specks on one side of the base of the wooden block that houses the unit. GASP! I pulled the block up and there it was, right underneath: more greenish-grey particles mixed in with a white fuzzy substance (see photo 1). Turning the block upside down, there was even more guck under that (see photo 2). Now comes that sinking feeling in your gut. Check the cigars!!, my brain screams. Fortunately, the cigars were clean. So, the question arises, how do you rid your humidor of mold - and as permanently as possible?

First, let's take a look at what causes mold. Mold is more often found on your cigars than in your humidor, and mold is most likely to appear when the RH in your humidor exceeds 75%. The longer you allow the RH to remain that high, the more likely you will find a fuzzy substance on your precious primos that manifests itself in white, grey, green, blue, or even dark brown. Add an equally high temperature and you're just begging for trouble.

According to one source, cigar mold can even come from handling your cigars with dirty hands, so it's best to wash your hands before you rotate your cigars or place new cigars in your humidor.

Most of the time, your cigars can be salvaged, especially if you catch the mold early. In my case, the cigars were OK and the humidifier didn't appear to have any mold on it, so here's the proper way to clean out your humidor.

1.  Remove all of the cigars from your humidor and place them in a large, zip-type plastic bag to keep them fresh.
2.  Using a small hobby vacuum or the flat extension on your home model, completely vacuum out the inside of the humidor. You can also give the box a light sanding with #150 extra fine grit sandpaper, first. This will help remove any mold spores that may be forming. It will also give your humidor a fresh Spanish cedar scent like when it was new.
3.  Take a paper towel, clean dust-free cloth, or a new, clean sponge dampened with Isopropyl alcohol, and very lightly wipe down the entire interior of the humidor. Don't overdo it; you just want to make sure that any residual mold spores have been treated.
4.  Wipe down the humidor again, this time with distilled water. Make sure it's 100% steam distilled water, not the distilled water used for drinking. This will dilute the alcohol that has seeped into the wood. Again, don't overdo it, as most of the alcohol will evaporate naturally.

This process will probably add a little extra humidity to your humidor, which may have caused the problem in the first place. Therefore, don't close the box just yet, and make sure the walls are dry before putting your cigars back in.

I think I know how my problem may have occurred. When I had last recharged my humidifier I noticed it was really saturated, but it wasn't leaking. However, it might have been just a matter of time before enough water collected via gravity to spill over the edge of the block and work its way underneath.

mold on humidifier housingIf it wasn't mold that I was dealing with, it could have also been mineral trace elements. Also called "water scale," this chalk-like substance comes from using hard water in lieu of distilled water. For this reason alone, never use tap water, filtered bottle water, or even boiled water, because mineral deposits will continue to build as the humidity in your humidor evaporates. However, unlike mold, which tends to spread quickly, water scale does not.

I never use anything but distilled water in my humidifiers, so I'm still leaning toward mold, but the evidence also pointed to water scale since it was limited only to that one spot in the box and the cigars were spared.

Either way, neither substance is good for your humidor or cigars, so inspect your humidor often, and clean it on a regular basis, too. Just a simple wiping down with distilled water is usually all you need to keep your cigars' environment clean and your cigars happy.
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