Having worked at a lead smelter for years and years, I can tell you what works for those with high blood-lead levels:
1. milk (and other high calcium foods, assuming you have good stomach acid levels) - it partly eliminates lead from your body and partly drives the lead into your bones. In years gone by they would actually give milk rations to smelter workers to help control blood lead levels. Your bones are continuously ripped apart and rebuilt, so that lead will slowly come out and be eliminated by your body, assuming you don't have NEW lead inputs (over years and years). If you don't have good stomach acid, then soluble calcium supplements work (calcium citrate, for example).
2. EDTA - one form of chelation therapy originally developed for lead exposure in the ship building industry. The intravenous treatments work best, but you need a lot of them (typically 10-20 rounds are done around here). That is a lot of time on the IV, and it depletes your body of other minerals too. Oral EDTA also works for modest lead levels, albeit more slowly. You need to take the Ca-EDTA and NOT the Na-EDTA form, as the sodium form will strip calcium from your body and can make you very sick very quickly. Available in tablets and capsules, best taken at night apart from any food.
3. Chlorophyll - known to bind lead and other heavy metals when taken orally. Not for more than very minor lead levels, as it is slow (months). Truly high chlorophyll foods are things like wheat grass (modest), spirulina (an algae, medium) and chlorella (another algae, among the highest levels). Alfalfa is also not too shabby (on the wheat grass level), but could have other side effects in men due to phytoestrogens.
4. cilantro - as mentioned above. It has a little chlorophyll but seems to also have other stuff that helps the body excrete lead. It's action is weak. Parsley should work similarly. You need to eat a lot (think half a cup or a cup a day). There are "natural" protocols that have you eat both cilantro and chlorella, claiming some synergistic benefit, but I am not aware of any scientific studies.
So - if you want to eliminate some trace amounts of lead, some cilantro, parsley, wheatgrass and such (and milk). If you have a little concern for a little lead, then milk, lots of chlorella and the like. If you have a significant concern (blood leads in the 30+ ng/dl) then get at least oral Ca-EDTA or intravenous EDTA treatment. If you have high blood leads in the 40-50 ng/dl levels, then do everything, including emergency intravenous EDTA.
It all depends on what your exposure, exposure time and base health levels are. I have gotten high blood leads despite religious use of personal protective equipment, and I believe it was mainly from lead oxide contaminated dusts that I would end up breathing in/ingesting from my coveralls, boots etc. whenever I took OFF my PPC. I haven't seen a lot of data suggesting casual contact with some lead, like in casting or shooting, that would give you big lead oxide dosages like hanging around a lead smelter would for 12 hours a day, 6 days a week...