Impossible to clean solder mess -microsoldering 0201

[GregRS]

Hello,

I want to ask if someone could help me with my big mistake cleaning/resoldering 0201 filter on my board..

My mistake was: Taking Sn 0,3Ag 0,7Cu 2%Flux solder wire at the place of my standard 60/40 or 63/37 solder wire with the same little diameter.

I have a terrible mess around my element pads etc.. and I tried to clean it with solder wick (2 types) of course with flux, but this thing won't stick and get off of my boards.

It melts very slow with 420-450°C and go back(hard) immediatly (2 times faster than standard tin)

I tried to add a little bit of standard 60/40 solder to easier suck it with solder wick, but this thing still won't get out... I can melt it and move a little on sides etc but I have absolutly not idea how to get it out from my board. (Remember it's 0201 element so I have to be carreful with other parts next to it.

I have 2 different quite  good irons with smaller and bigger tips and AmScope SE400-Z microscope so I think, I have enough of basic hardware to do it, but absolutly no more ideas for that bad situation.

PS: I'm amator still learning and I don't have hot air station.

Sorry for very bad quality of photo - taken with temporary old smarphone, in real it's mutch better and clean view.


I will appreciate a lot any kind of help!

Thank you and have a nice day!

[SilverSolder]

Take your solder braid, add a little flux to it, and use your iron to wet it with a very tiny amount of 60/40 solder.  Use this prepared strip as a "floor mop" under your soldering iron to wipe the unwanted solder away from the board.

400 degrees sounds very hot and that definitely risks damaging the board.  350 degrees or even less should be enough - try to figure out the lowest temperature that it will reliably melt at (by experimenting with the 'bad' solder away from the board).   The idea is to use "enough" heat, and not more than that.

It is a good idea to practice all this on a piece of scrap board before attacking the important project.

[TimCambridge]

And cut off a few cm of braid so that you're not using the whole reel as a heat sink

[GregRS]

Thank you VERY much for your responses and ideas for my problem, 
first I will take some old board to recreate the same mess on bigger surface to test mixing that "very bad" solder with normal 60/40
to reduce melting point on my "1st, main and important" board.
I think that idea with test on the other board is a great idea.

Thank you very much again and
have a great day/evening (depend of your time zone)