Use a floss pick to take off acrylic nails when you're done with them, or they start lifting. A slightly better alternative if you're just going to rip them off. It also doesn't hurt. Mind you, not as good (for your nails) as soaking them in acetone, but a lot quicker. #diy.
Scraping out moldy caulk from around a bathtub is a tough, tedious job. And if you get too aggressive, you'll chip a tile or mar the tub finish. Make the job a lot easier by first softening the caulk with a caulk remover.