I have a 22 inch section of wall in the master bathroom and it is bowed, which is causing no end of problems with installing a new corner vanity and corner cabinet. It is square at the top, bowed in about 1/2 inch in the middle and out of square about a 1/4 inch at the bottom. I haven't a clue as to the best way to fix the problem and make the corner square from top to bottom.