Place a thick towel over the 膠字, iron on the thick towel.
Do not adjust the temperature to highest, just iron on the thick towel to see if the 膠字 is ok... If not, adjust higher temperature...
everyone have different feeling....
I dunno how obvious is the mark....
If you reli not satisifed, I suggest you taking a photo, circle the mark and report to the customer services deprtment by email....
Do not remove the tag... see if what they advise....