>>2929765
i recommend chipquick's sn42/bi57/ag1 solder.

https://eu.mouser.com/ProductDetail/Chip-Quik/SMDSWLT.047-8OZ?qs=Wj%2FVkw3K%252BMBivQ2Imf8Z0A%3D%3D

Flows really well for a lead-free solder, relatively clean and doesnt increase the probability of chronic retardation like the lead based ones.