i use a toothbrush with a single rub on a soap bar. my pen is good for testing ph of most liquids so i dont think soap will hurt to much.
phatsesh101 Reviewed by phatsesh101 on . How do you store/clean your ph pen? Ive noticed some small stuff stuck up in my pen so I need a good safe way to clean it. I was reading some things and am now curious about how everyone stores their pens. I need to find a good way. Rating: 5