in some runs iam having that problem with airpots,,,,, so i take once in the week the airpot into my shower and give them abath and ashower from above, that means i let them stand into the shower, put the shower very low and let the water run into and out of the pots for along time.....
soetimes i take the pots and let them drown into another bucket, and soak up ( in summer the outdoor plantss)
to avoid that i try to water daily