My ph/pm meter is gunked up and I’m wondering how to clean it, I was thinking I could use a toothbrush to get in there but what should I put on the toothbrush to clean it with?
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man that is messed up… I would soak in warm distilled water and use a kids toothbrush since they are usually softer and smaller to get in there… now you know you need to clean it after each use from now on…
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Bluelab makes a cleaning solution.
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I think maybe some warm to hot water and a small stiff artists paint brush.
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I didn’t use any storage solution for a length of time between grows and mine grew a ball of mold around the pH & EC probes. I used a warm mild vinegar/water solution and a cotton swab. Pulled some of the cotton off and used it like dental floss around everything then followed that up with a mild isopropyl/water rinse, 
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I would recalibrate after cleaning.
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