I am far from an expert on cigar maintenance but I do have some good experience that I can offer to help revive your humidor…
The first thing you need to do is go thru your cigars and see what is worth saving. Then get some Humipacks. I have the brand I prefer located on my Homepage under “products I recommend”. Next, Take your cigars and place put them in a ziplock bag with at least one Humipack..depending on the amount of cigars/size of the bag.
The next thing I like to do is really clean the entire humidor from any losse pieces of tabacco. I use a small shark vacuum then wipe the rest down with a damp cloth(only use distilled water). The next step is to get the humidity level back to a consistent number. I prefer between 69-70. If you have a small humidor then you can use a variety of humidification tools. You can actually use the same Humipacks mentioned earlier. They usually last around 30 days, so you’ll have to keep an eye on them to change them out when needed.
My Humidor is pretty large so I use the Cigar Oasis to keep the humidity consistent (Click Here to read more about it). The Cigar Oasis has a built in digital display that shows the humidity level at all times. If you are going to use another humidification device, then make sure you buy a small Hygrometer. These are relatively cheap (Around $10) and available at all local cigar stores.
In Conclusion… If you want to keep your cigars fresh then they need constant attention and a consistent environment. If you have neglected your humidor..dont worry. It can be saved and brought back to life using the simple steps above.