Quoted from GRUMPY:You need a bigger iron.
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What Grumpy said. It's not entirely about a hotter iron (of course, that does help), it's more about contact area. A chisel tip is perfect for this application. You can maybe put the tip on it's side. Might be awkward, but will help.
How many watts is your iron?
I usually get some fat solder wick and wick off as much as I can in short order so I don't damage the board.