What is the primary concern when working with hydrofluoric acid in cleaning?

The primary concern when working with hydrofluoric acid in cleaning is skin burns. Hydrofluoric acid is highly corrosive and can penetrate the skin, causing severe tissue damage and burns that may not be immediately apparent. Unlike many other acids, hydrofluoric acid can cause deep tissue damage, leading to significant health risks, including chemical burns that may harm the underlying tissues and bones.

The danger it poses to the skin is significant enough that anyone handling it should have proper personal protective equipment, including gloves and protective clothing, to mitigate the risk of contact. While respiratory issues, eye irritation, and inhalation risks are important concerns when dealing with hazardous chemicals, the immediate and potentially irreversible damage it can cause to the skin makes skin burns the primary concern in the context of hydrofluoric acid.