Check w/ Matia first. In some cases she may advise waiting -- even a regular cleaning can cause issues if your body's not strong enough to handle it.  Other suggestions- Request that they use that sucking device as they clean or leave it in your mouth so you don't swallow the bacteria and gunk that's coming out.  And when they're polishing your teeth w/ the special toothpaste at the end, don't swallow during, and ask to spit & rinse right after.  And no fluoride of course.