Struggling with cleaning the refractor - test around Collinder 258/weird pattern on eps cru. (Claudio Tenreiro)

Struggling with cleaning the refractor - test around Collinder 258/weird pattern on eps cru.

I am cleaning the objective of my refractor FRA600, first using the polymer, First Contact, following instructions, some polymer pass the O'ring into the border of the lens, after application, not all the residues came out so I notice some very fine "red hairs" on the surface of the lens. Next I did try to remove them individually (applying polymer on the top of those areas), and it seems that worked ok, but it was not able to remove all the dirt, so I did cleaned again using now a Zeiss liquid for optic applications, this worked a lot better. I took this image and you can observe a very weird pattern on the epsilon crux star...so, still something is left on the surface.
In order to get something interesting I did the test in a region of a few open clusters, plus the planetary nebula WRAY 16-112, which I show in a separate image, heavy crop of the larger image.
Regarding the cleaning, I will try another try using the Zeiss cleaner liquid.

PS: I added two crops of the image, one with the planetary nebula and one with Cr 258, which was not identified when solving the image.

B

Title: Detail of the Planetary Nebula

Description: Just cropping to see the PN

Uploaded: ...

C

Title: Caldwell 258 or Cr 258

Description: Crop of the image with the Cr 258, which is not identified by the solving of the image.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	9612290
PixInsight job	58O3KCQL9Y88AFMMKQFQ03JA4RGDZAC5
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h24m56s.93
RA (top/left)	12h32m05s.28
RA (top/right)	12h30m13s.31
RA (bottom/right)	12h18m15s.47
RA (bottom/left)	12h19m15s.44

Dec (center)	-60°59′15″.8
Dec (top/left)	-62°02′28″.6
Dec (top/right)	-59°47′59″.9
Dec (bottom/right)	-59°54′43″.3
Dec (bottom/left)	-62°09′40″.5

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