Bloodletting is a solution. Donate blood as frequently as they allow you. Plasma donation works even better (higher frequency) if you trust the machines and the process.
Sadly, it's not a complete solution as some harmful substances bio-accumulate in other tissues. A benefit may be had regardless as some substances leach back into the blood if the concentration gradient is sufficient.
What makes you think it's a solution?
If the logic is "get rid of your bad blood, let your body make some good blood instead", why would the body make the good blood if all we consume is full of plastic anyways?
Even by that logic you should still dilute your blood, because if you don't you will accumulate plastic faster...
You will see a benefit for any and all harmful substances for which blood tests exist. Because the blood test implies blood levels being a proxy for the substance so it either accumulates there or leaches into it.
Blood is less than 10% of your weight. Donating 100% every month (!) would only reduce your exposure by the same, a trivial amount in dosage variation.
The solution to bioaccumulation is to give it to someone else?
<vampire typing comment above meme />
Source?
Aside from the fact that dilution of blood is obviously dilution of any and all substances in the blood?
https://pubmed.ncbi.nlm.nih.gov/35394514/
2 millennia of bloodletting medical practice. /s