how to take wiper switchout of cluster??

If you actually need to remove the nut, here's the "special tool" you need...
get a common metal dinner fork, (not your wife/mom's best, obviously) bend over/cut off the center two tines if it's a normal 4 tine model...and there you are! Careful use of a small pair of needle nose plyers can get the job done too.
Another cheap tool, for glue on emblem removal...get a butter knife (non- serrated) and slip it in the tool box on the next trip to the junkyard. Works like a dream.
Sometimes the best stuff is in cars at the junkyard, not from them....