Has anyone found any OTC relief for gustatory sweating following a parotidectomy? Did the problem improve with time or does it just keep going?

My husband has always been one who perspired like crazy upon eating spicy foods, but since the parotidectomy and selective neck dissection, anything he eats causes the right side of his face to pour.

I've only begun the research on this result of treatment and am hoping someone has some hints. He's only just beginning to heal, so we are hoping it improves with time. I've read you may have success with certain types of roll-on antiperspirant, but I'm not willing to try that on his skin just yet. If you have found something that helps, we'd appreciate the information.