Here in 'dry as a bone California' that is not much of a problem so I have no direct experience. I would suggest sealing them up with baking soda in a snap lid plastic tote.
For cleaning the vinyl, I have found 70% distilled water, 25% isopropyl alcohol (95%), and 5% sulfamic acid (home depot tile and grout cleaner), 2 drops PhotoFlow or one drop JOY works well. The sulfamic acid is likely to make vinyl purists shudder and doubt my sanity. However, records are nothing but PVC and the RYAN HERCO catalog list the compatibility as excellent. If a record has been cleaned in tap water my mix takes the calcium off somewhat. Most mixes I tried with a pH greater than 5 did very little good.
I am off work today screwing around with the old Carvers until friend show up for a barbeque.
Bill