But do you think they all have the same intentions?
If I understand you correctly, Yes (various activator/reactivator/tip rejuvenator ... type products). I've the Weller branded version, and it works well. As others have mentioned, it's used occasionally.
Given the rest of your posts, it's definitely time to try a different solder. As per what to recommend though, what do you need?
I know Stannol & Multicore have better availability than say Kester (Farnell imports it), and also has better pricing from what I've seen. If you're after say 63/37 though, you'll have a tough time finding it in the EU from what I've seen (i.e. Multicore dropped a lot of their leaded offerings a few years back). 60/40 would be easy to find though, and the lead-free formulations as well (I use Alpha Metals'
Telecore HF 850 in SAC307 for such needs; core size is P2 & .032" dia.).
Flux wise, I'm partial to RMA & RA, but that's not always available. So when I have to use a no-clean formulation, I prefer the modified rosin versions as it's easier to clean than those that use synthetic resins. Skip the organic/water soluble stuff IMHO, as it can't be left on the board (must be cleaned). Just a PITA for repair/prototyping/hobbyist use IME.