I'm not saying the more aggessive solvents do or don't affect soldered ribs. I'm just going with what works for me and if I'm going to be wrong, I'd rather it be by not using something I don't need. I don't use Borax soap everytime I wash my hands either.

But let's be clear here, solder is about 2/3rds tin with the smaller portion being lead. So, the care of tin is at least as much a concern as the lead.