If you must, I'd remove tank & throw away, disassemble all parts scrub in dishwashing liquid, rinse well, rubbing alcohol can damage some seals & o rings, no way to tell until too late.
PGA is the only alcohol I would use, then a good rinse.
The 510 is really grungy, it will have to be thoroughly cleaned & de funked, bright & shiny, threads may be compromised making the whole mess unusable.
It isn't about being cocky, if you believe attempting to resurrect a not very good to begin with, old crusty delivery device is worth your time, energy & money go for it.