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I would pay them off and request from the collection agency a letter of deletion. They say it's the discretion of the CRA if they will or not, but I didn't have a problem having mine removed after I paid them off. I had a total of 9 delinquent accounts and were as current as March of this year. I paid them all off by April and called the collection agencies handling them. As soon as they were deleted from my credit report, yes, all 3 (EX, TU, EQ) deleted every single one of them, my score went up significantly.
Only thing I can't get deleted is the released tax lien from EQ and TU. EX deleted it already. Good luck. Hope you get can get it off your record.