Removing Bluish Marks from Your Stainless Steel Inner Pot
Instant Pot’s inner pot (cooking pot) is stainless steel, food grade 304 (18/8) with no chemical coating. It is durable and will retain its appearance for years to come with proper care.
With stainless steel cookware it is not uncommon for a bluish or “rainbow” discoloration to appear on the inside of the pot, and Instant Pot’s inner pot is no exception. Minerals or salt in the food and water are the cause for this discoloration. It may be easily removed by using a non-abrasive stainless steel cleaner, which will not only remove the marks it will help to retain the original brightness.
Another option is to cover the bottom with white vinegar. Allow the vinegar to sit for 5 minutes, remove, and rinse the inner pot. The discoloration marks should be removed completely.
For “White Hard Water” stains, they can be removed with a damp sponge soaked in vinegar or lemon.
We recommend avoiding steel wool, as it will scratch the surface. For additional information, verify “eHow” or “British Stainless Steel Association”.
The images illustrate an Instant Pot® inner pot after an 8-month period of regular use and the results after using white vinegar to clean the stains.