Possible Clues:

• Covered by water - sounds cleansing
• Covered (with water)
• A part of East Anglia's flooded
• Just above the water
• A wide wood becomes flooded
• Flooded (with)
• It gets you clean, but not quite under
• A laundry is inundated
• Ah, what was in there but lots of liquid?
• Overrun