Related Clues:

• Word with bubble or opera
• Cake composition
• It's found in bars
• Zest, e.g.
• Ivory or Coast
• Hotel amenity
• It's slippery when wet
• Rug cleaner
• Stuff in a bar
• Dove, e.g.
• Laundry room staple
• Cleaning agent
• Mineral
• The end of each of 20- and 56-Across and 11- and 29-Down is a popular one
• Hair salon request