I am sure i have seen similar threads around but cant find them

Today I got out the bags and bags of clothes we had put away from when DD was little. There were 5big garbage bags full.

SO I have gone through all the bags and kept out what I want to actually keep for any future children but some of the lovely things have stains on them, like that yellowing kind of stain. I am sure I washed everything before I put it away but I keep thinking something must have been missed as the cothes kind of smell a bit as well. Cant put my finger in the smell though

So how do I clean them?

What do you use?

If I bleach the white things, how long do I leave them in bleach for? I dont want them to turn yellow from over bleaching.

After they are all clean and dry again, how do I store them?

Is there something I should put in with them to keep them smelling nice and that will stop them going yellow?

Thankyou, thankyou thankyou!