Why is my Sim sparkling?

Check your lot traits - those with skill boosts will have that "sparkle" of lightbulbs and plus signs when your Sim performs that action.

@spontaneousivy - got it - he was cooking and lot has chef trait - right? I had not noticed that before.

@simstr0ng Yup, and it will always appear with the trait on - even with the cheat headlineeffects off.

So I understand why my sim would sparkle when performing a certain task but what does it mean when the entire house sparkle? Does it mean that my sim likes a clean house and the house is clean or does it mean something else? Sorry for the loaded question in advance.

It does just mean the house is clean.