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When replacing drywall sheets, how does one replace corner beads, inside corners or tapered joints? Say a drywall wall sheet has been removed and the ajoining drywall sheet is attached by an inside corner, outside corner (corner bead) or a tapered joint. After the paper tape or corner bead is removed from the joint, there will be a tapered ridge of mud left behind. After the new drywall sheet is attached to the wall, the corner or tapered joints need to be mudded again. Does that residual ridge of mud on the older drywall need to be removed before new joint compound can be applied?? Any advice on this is appreciated. Thank you. 