Koshering Utensils

Hi Rabbi – can one use silicon utensils (soup stirrer, spatulas, etc. that are used directly in a pot/pan when cooking) on Pessach if they are used year-round? Same question for plastic-based kids utensils (not used directly in pot/pan but in contact with hot food).

Including here a link to make it easier for you to have an example:


Kids utensils: 

Thank you!