Dawn Original contains synthetic fragrance — a trade-secret ingredient blend that can include dozens of undisclosed compounds, including phthalates used as fragrance carriers, synthetic musks, and contact allergens. This fragrance comes into daily hand contact during dishwashing, which makes it a meaningful exposure route compared to a cleaning product that is simply sprayed and wiped. Dawn also uses synthetic dyes for its characteristic blue color, adding another cosmetic ingredient with no cleaning function.
Fragrance-free dish soaps remove the fragrance package and typically the synthetic dyes as well, leaving only the surfactants and preservatives necessary for cleaning and product stability. Cleaning performance is identical — the surfactant chemistry does the grease-cutting work, not the fragrance. Many fragrance-free dish soaps use the same surfactant bases as their fragranced equivalents.
For daily dishwashing, fragrance-free is the lower-exposure choice. Fragrance-free dish soap rates 'better'; Dawn rates 'caution.' The concern is not acute toxicity — Dawn is not a dangerous product. The concern is cumulative daily dermal exposure to undisclosed fragrance compounds over months and years. For households with anyone who experiences skin irritation, eczema, or fragrance sensitivity, the switch to fragrance-free dish soap is one of the most straightforward low-tox household changes available.