It has been years since I owned an accurite. I'd also never use an absorbent foam in the enclosure anyway so pull it off. If the probe measures humidity and temp it is likely going to have an opening and is quite likely the resistive sensor is soiled and less accurate than it was before. If it has an opening to electronics I'd not bother with it a toss it out. If it is sealed just wipe it off and disinfect like anything else and return it.