Customer called us out for a kitchen sink that was backing up. I inspected the garbage disposal and found lots of glass in it. I recommended doing a disposal reset and cleaning the ptrap to clear the glass that made it through. Customer agreed. I vacuumed out the glass and cleared what was stuck in the teeth and drains of the disposal by hand until it would run again. I then removed the ptrap and cleaned it out. I reinstalled it and tested the disposal and trap throughly for any leaks. Customer said he might want to replace the disposal soon so I left two estimates for him.