Sensor cleaning and lollipops - merged thread.

[High_n_Dry]

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On 5/15/2025 at 4:48 PM, jaapv said:

So where did the residue come from - it must have gotten onto the gel somehow.

I believe the residue was from the gel. 

It was brand new and straight out of the package. I bought from BH, so I’m pretty sure it was legit.

Like I said, I’m sure it was user error, but not quite sure what I did wrong.

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[jaapv]

Well, I always try things like that out on an old filter - you would have noticed the problem -if there- and cleaned it with Isopropyl Alcohol. If it smeared afterwards it would have been proof that the sensor had microdroplets of oily substance instead of dust that smeared and you could have removed the smears with Smear-Away or Eclipse wet cleaning.