No. Yes. Well, maybe. Pressure washing can be effective in cleaning the teak furniture, but you need to be very careful. You must use a wide nozzle (40 degrees usually) and keep the nozzle at least 12” away from the surface. If you are not careful, you can make the surface bumpy and scratchy, or even make divots in the wood.
Read Pressure Washing Teak Furniture for more information.