ACF50 -google it, use it on everything that needs protecting, can even be sprayed into switches and other electrical gear-a little goes a long way.
My mate bought a de humidifier, sung its praises, "cost plenty" he said, "collects buckets of water", my other mate who is an HVAC engineer informed him that unless he was using his 'electrical water collector' in a small building well sealed (nearly hermatic) then he was effectively using his electricity to 'dry out' the atmosphere around and within the Central Scotland area-that convinced me not to spend my hard earned on an "excellent purchase".