I'm just wondering if this will be an issue.
I've soldered on the headers to a pizero there is some rosin flux (hard) left still on the board.
Pi turns on and works but i'm wondering if it will effect it at all. The only thing that doesn't work properly is the wifi dongle which is the RTL8188CUS 802.11n WLAN Adapter. It keeps dropping out but have heard these are problematic dongles.
I'm just wondering if the rosin left on the board could add to the Wifi dongle's problems.
Here's a pic: