How do i dismantled the power window contact switch for cleaning for the bmw 3 series.Plz advise anyone?

By Taking A Small Screwdriver And Gently Prying The Small Plastic Clips On The Bottem Of The Switch, You Can Open The Switches. After The Clips Are Removed And Access Is Achieved Then Try Using Some Glass Cleaner On A Clean Towel To Remove The Crap On The Contacts(mine Had Tons Of Spilled Pop On Them) Also Some Light Sanding Can Work.