Spot cleaning on Chol Hamoed

 https://dinonline.org/2021/03/25/spot-cleaning-on-chol-hamoed/

What kind of cleaning clothing is permitted on chol hamoed?

1) Spot cleaning by hand with soap if there is dirt/grime? Does one have to take care just to wash that exact area and not any other parts of the garment?

2) What about cleaning the whole garment by hand for smell?

3) What is the difference between children and adults?