the stainless steel inner pot has rainbow-colored stains after i made rice, how do i clean it

Diagnosis

The rainbow-colored swirls appearing on the interior of your Prestige 3.3L Deluxe Alpha Handi are known as "heat tints" or "oxidation layers." This phenomenon occurs when the chromium in the high-grade stainless steel reacts with oxygen at high temperatures, creating a microscopic layer of chromium oxide on the surface. Because the layer is incredibly thin, it refracts light into a spectrum of colors, similar to oil on water. This is most common when cooking starchy foods like rice, where the liquid evaporates and the temperature of the steel surface rises rapidly. It is not a sign of poor quality, nor is it rust or a chemical contaminant. You can confirm this is a heat tint if the stains are smooth to the touch and do not flake off, but instead appear as a translucent "film" integrated into the metal.

How to Fix It

To remove these stains without scratching the polished interior of your Alpha induction base pot, follow these precise steps:

1. Acidic Pre-Treatment: Dampen a clean microfiber cloth or a soft sponge with white distilled vinegar or lemon juice. Apply the liquid directly to the rainbow areas. The acidity breaks the bond of the oxide layer without needing abrasive scrubbing. Let it sit for 2 to 3 minutes.
2. Create an Abrasive Paste: If the vinegar alone doesn't work, mix 2 tablespoons of baking soda with 1 tablespoon of water to create a thick, toothpaste-like consistency.
3. Targeted Application: Apply the paste to the affected areas using a non-scratch scouring pad (the blue or white ones, avoid green heavy-duty pads which can leave micro-scratches on the Prestige mirror finish).
4. Circular Motion Scrubbing: Gently scrub the stains using circular motions. Because the Baby Handi has a curved bottom, ensure you are applying even pressure across the base and up the side walls.
5. Neutralize and Rinse: Rinse the pot thoroughly with warm water. Use a mild dish soap to remove any remaining baking soda residue, as leftover powder can leave a white cloudy film once dried.
6. Buff Dry: Immediately dry the pot with a lint-free cloth to prevent new water spots from forming.

If That Didn't Work

• Use a Specialized Oxalic Acid Cleaner: If the tints have "baked in" due to repeated high-heat use, use Bar Keepers Friend (powdered version). Wet the pot, sprinkle a small amount of powder, and rub gently with a damp sponge. The oxalic acid specifically targets mineral deposits and heavy oxidation that baking soda cannot dissolve.
• The Boiling Vinegar Method: Fill the Handi with a mixture of 2 cups of water and 1/2 cup of white vinegar. Bring the mixture to a simmer on your induction cooktop for 5 minutes. This "boil-off" method cleans the entire interior surface simultaneously and is highly effective for deep-seated rainbow stains.
• Commercial Stainless Steel Polish: For the exterior or the rim where stains may have migrated, use a non-abrasive stainless steel polish. Apply a pea-sized amount to a cloth and rub in the direction of the grain.

Heads Up

• Avoid Steel Wool: Never use steel wool or wire brushes on the interior of the Prestige Alpha series. These will create deep scratches that trap food particles and make the pot more prone to staining in the future.
• Manage Induction Heat: Since this is an induction base pot, avoid using the "Boost" or highest power setting for extended periods. Once your rice reaches a boil, drop the heat to a low simmer to prevent the steel from overheating and causing new heat tints.
• Dry Immediately: Always hand-dry your stainless steel cookware immediately after washing. Allowing the pot to air-dry leads to "water spotting," which can be mistaken for heat tints but are actually calcium deposits from your tap water.
• Avoid Chlorine Bleach: Never use bleach-based cleaners on this pot. Chlorine can pit the stainless steel, creating permanent microscopic holes in the surface that will ruin the "Deluxe" finish.