Cleansing the glass optical window

There are some resin leaks to the glass optical window. Then I tried to clean it with IPA and PEC PAD, but why there are some marks left after the IPA evaporate? I have followed the procedure listed on this link

You may find and answer there if the marks look the same :

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I’ve found that sometimes it takes a few tries to get right. Often, the first try just spreads the smudges and subsequent tries begin to remove the smudges. I’ve found the window coating is pretty robust, so using some elbow grease the the pec*pad helps.

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