One way to clean a pine is to start at the top-centre and work outwards along the branch, removing the needles with your fingertips. You may want to wear gloves during this process to avoid irritation however sometimes it is easier to remove the needles without that extra layer covering your fingers.
You can also rake the needles using a pair of bonsai tweezers. Tweezers are also handy for stubborn yellow needles that are more difficult to remove or needles that have become stuck under wire or between green needles.
Needles that fall from above will need to be cleaned off lower branches.
Start cleaning from the centre of the branch outwards, towards the tip of the branch.
Now your bonsai is free from yellow needles!
Once all the yellow needles have been removed, use a coco brush to gently remove the fallen needles from the soil and the base of the tree.
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