Plumbing Water Stream Issue?

Hot water line to the vanity sink running very slowly. As well, the galley sink's water lines run very, very slowly.

Has liquid bleach been used as plumbing line clearing remedy by anyone here? Bleach seems to have a lessening effect on mineral deposits lefts by hard water on porcelain fixtures, so why might it not remove the deposits/build-ups in RV plumbing lines and faucets?