it depends on what you really need to install, not based on which part should install. Identify which areas of bushings that needed to be changed first then you'll know which part to install.
How to clean Bike's Chain and Crank ?
Be it Bikes or Bicycles, chain and cranks are common to both.
Chain and the crank get dirty as you use your cycle. The dirt which is basically sand / fine mud needs to cleaned off , else it eats away the...