Based on our own experience using this product for automotive welding we highly recommend Aodesy Replacement Soldering Cleaning. It effectively removes solder flux residue and general dirt from the soldering tip... PLUS, it's affordable and works great for any welding tasks. The only downside is the strong odor, but the results make it worth it..
Continental Conti4x4Contact 265/60 R18 110H summer
23 Review
Hakko T18-BR02 Soldering Tip - T18 Series for Hakko FX-888/FX-8801 - Conical Shape - Bent 30 Degrees - R0.2 mm x 10.5 mm
12 Review
309LFC-O X .035 X 1LB Spool Gasless Stainless Steel Flux Core Welding Wire by Blue Demon
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Hakko 599B 02 Wire Type Soldering Cleaner
11 Review