After making the cake with egg ingredients, cookware usually smells fishy, despite being washed many times.
To fix this, try the following:
Boil water in a saucepan until boiling, then insert the tool into it smells fishy. Allow a few minutes, remove from heat, then wash with soap to clean, smells fishy is guaranteed and disappear instantly.
If the smell still wafted, put lemon juice into the boiling water, and soak your cooking utensils.