Best for: porcelain/ceramic sinks, tubs, showers, grout, cooktop drip pans.
Avoid: natural stone, soft plastics, stainless steel with mirror finish (may scratch).
You’ll need (makes ~1 cup / 240 ml):
- ½ cup baking soda
- 2–3 tbsp castile soap (enough to form a thick paste)
- 1 tbsp 3% hydrogen peroxide (brightens; optional)
Steps:
- In a jar, mix baking soda with castile soap to a frosting-like paste.
- Add peroxide last and stir gently (don’t bottle with vinegar ever).
To use: Spread, let sit 5–10 minutes, scrub with a soft brush, rinse well.
Shelf life: 1–2 weeks in a sealed jar. Stir before use.