There could be Don. I've used the two-part strippers with good success. If
the deck has Cetol (or one of their clones) you have a more difficult
problem. Both parts are very caustic so I recommend wearing disposable shoes
(and not flip-flops unless you want to watch the soles of your feet
dissolve), have copious amounts of water to wash the detritus from the teak
surface, and take care splashing the chemicals onto the sides of the vessel.
It make take a couple of applications to get the color out, but it does
come.