“In terms of washing, it should remove some residues on the skin of a product (which will often be fungicides used to prevent rotting during storage and transportation). However, many modern pesticides are what are called ‘systemic’ which means that they are absorbed into the plant and distributed throughout its tissues, reaching any fruits or flowers. As a result, pesticide residues are often contained within the body of the produce itself and therefore washing the surface won’t remove them.”
If the goal is to reduce ingestion of substances applied to crops, then what you describe is not a reasonable hedge as both "organic" and conventional crops use pesticides, herbicides, and fertilizers. You're better off saving your money by buying conventional produce than spending extra money on the purchase of the same thing.
Some useful points:
- EFSA reports show that conventional agriculture exceeds the approved maximum residue levels more often and by a higher margin
- A study in Sweden reveals a significantly higher (70x) exposure in conventional food vs organic
[1] https://ehjournal.biomedcentral.com/articles/10.1186/s12940-...
I agree that such substances should not post a risk to human health, but there is no argument that organic crop products are any better for humans than conventional products.