Squeaking under the hood

My truck has been recently making the squeaking sound coming from my engine bay, I noticed it squeaks when my truck idles or when I step on the gas. I don’t know if it a pulley or a belt, I noticed when I hit the inside of the engine bay with a power washer the squeaking stops for a couple days. Anyone know what might be the cause. Also I’m debating on getting it professionally detailed to see if that does the trick?

 

Probably the serpentine belt or related pulleys/tensioner. My tundra did the same.

 

Mine did that and the accessory drive belt was recently replaced under warranty

https://www.tsbsearch.com/Toyota/T-SB-0098-20

 

Thanks I’m going to look into that

 

Update: Took it to the dealership, it was the belt. Got it replaced