Katek
Never mentioned bleach as I know it's banned in UK - merely trying to point out that even baking your own does not rule out additives whether they are food supplements, preservatives or anything else. Flour is not necessarily 'natural', it can also contain:
Calcium propionate (banned in Russia
Sodium benzoate (mixing with ascorbic acid creates benzene, a carcinogen)
Tricalcium phosphate (anti caking agent)
Butylated hydroxyanisole (petro chemical/ antioxidant)
I'll never bake a cake again 😲