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chongman420 Reviewed by chongman420 on . Mildew on my Ph meter Hey guys, I have a "Milwaukee Ph 600" ph pen that has been collecting mildew on it. I was wondering if there's an easy way to get it clean and keep it clean? I bought the ph meter cleaning solution as well as the storage solution. The cleaning solution doesn't seem to clean the mildew off very well. I usually keep the meter with the cap on it and I put a small amount of the storage solution in the cap so the probe doesn't dry out. But I'm worried the mildew will contaminate the plants' water. Rating: 5