SCUM

Surface refuse

• Ajax's target

• Aquarium buildup

• Bath water residue

• Bathtub buildup

• Bathtub dirt

• Bathtub residue

• Bathtub ring gunk

• Bathtub ring, essentially

• Bathtub woe

• Build-up in an aquarium

• Cleaner target

• Cleaning target

• Definitely not the elite

• Dirty film

• Disgusting film

• Dross

• Film on ponds

• Film on water

• Film you don't want to see

• Foul film

• Fountain build-up

• Grimy layer

• Growth on some ponds

• Icky pond surface

• Icky residue

• Lowest of the low

• Lowlife

• Man-bashing 1968 manifesto by Valerie Solanas

• Napalm Death's debut album

• Nasty film

• Not a nice film

• Offscourings

• Pond coating

• Pond cover

• Pond covering

• Pond dross

• Pond film

• Pond floater

• Pond gunk

• Pond patina

• Pond problem

• Pond refuse

• Pond stuff

• Pond surface

• Pond surface, perhaps

• Refuse

• Riffraff

• Scrubbing bubbles' target

• Shower-door buildup

• Slangy lowlife

• Soap ___ (bathroom grime)

• Soap ___ (mildew's cousin)

• Soap ___ (shower buildup)

• Soap film

• Soap residue

• Society's dregs

• Spray cleaner target

• Surface layer of impurities

• Surface muck

• The head on beer, essentially

• The lowest of the low

• Tilex target

• Trash

• Tub buildup

• Ugly film

• Ugly pond film

• Worst of the population

• Worthless people

• A film of impurities or vegetation that can form on the surface of a liquid