Next morning.....

You wake up still blindfolded, with a bucket of warm soapy water being tossed over you. You feel gentle hands wash you thoroughly, and then rinse you with warm water. You are given some fruit juice and what seems to be an energy bar.

I would use cold water. The shock value alone will get the hart pumping faster

(this could be an elaborate fake or permanent depending on your fantasy) if fake, would at least do one permantly but not in the open