I wipe all my guns down with a Sheep Skin saturated with RIG.You can keep that Silica or moisture absorber. Spend 25-30 bucks and get a Golden-Rod like Mainehunt suggested.I buy mine through Midsouth Shooters Supply. They run about the same as MH said.Plug it in and forget about it.If you have an extra amount of Moisture in your safe install a low wattage light bulb.I run a GR and a low wattage light bulb 24-7.

I would like to comment about the Golden Rod company.I had just installed a new GR. I accidently dropped the safe's shelf while putting the interior in.Naturally it landed right on top of the GR. It was badly dented.I checked later that evening and it still worked. I emailed GR with concerns of a Fire Hazard.I explained what had happened and it was my fault.That I didn't expect their lifetime warranty to cover it.I received a phone call asking me to return it to them with 7.90 for shipping. They replaced my Golden Rod.There's another company who cares about their customers.

Ruger Redhawk