Chlorine bleach is often the default choice for tackling tough bathroom stains, mildew, and grout — but most of those jobs do not require a disinfectant at all. Bleach's risks include respiratory irritation from chlorine fumes, skin and eye burns on direct contact, and dangerous gas production if it contacts acids or ammonia. For scrubbing tasks where killing pathogens is not the primary goal, bleach introduces unnecessary chemical exposure.
Baking soda (sodium bicarbonate) is a mild abrasive and natural deodorizer that is completely non-toxic. It scrubs soap scum, mineral deposits, and surface stains from sinks, tubs, and grout without fumes, residue, or any safety precautions. It can be mixed safely with water, dish soap, or hydrogen peroxide to boost its cleaning power. The only limitation is that it does not disinfect — it physically removes soil rather than killing pathogens.
For routine scrubbing of sinks, tubs, and tiles, baking soda is the safer choice by a wide margin. It achieves the same visible cleaning result without any of bleach's hazards. Save chlorine bleach for situations where you need confirmed disinfection — mold remediation, post-illness cleanup — and always use it diluted with proper ventilation.