Thx paul!
Your board will always be soldered using lead-free solder. IF you are going to do much with SMD, buy a small tube of organic flux and some solid solder wire. Or solder with organic flux in the core. Then you can use hot water and the tooth brush to clean them.
That was a quick solder job but i usually do smd soldering with solder paste and a heat gun
And my solder wire is lead free with flux inside so no problem, thank you again for the recommendations tho
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Just because it looks like a mess doesn't mean it has to be one 
But take @Paul_KD7HB 's advice nevertheless.
But from here I stop give advice what you should do now. Safest route is to change C3 before power the board, but the quickest way to know if it's damaged... 
Good luck 
Use the lead-free solder for production jobs.
Lead/tin solder is so much easier to work with when you're a beginner.
Leo..
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I'd be inclined to replace the bypass cap.
Remove it, use solder wick and clean off all the old solder, clean it up well with IPA and whack a new cap on.
Can't remember but I think they're 0402 on the TP4056 boards. But a through hole ceramic carefully tacked on will work. Just cut the legs as short as you dare.
thanks
Yup but on europe leaded solder its not avaliable unfortunally
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