It may sound odd, but each time I clean my biggest girl's tank (at least once a week, she's a Mad Poopa!), I just wear her around my neck and she snuggles up around me. She may get a little curious and sniff some things while I'm cleaning and walking through rooms, but she generally is so used to chilling for little bits at a time that she kind of setlles. This whole process for her usually takes about 10-15 minutes. Maybe try small cuddle sessions using the little hidey holes the other folks suggested?