Answer: sludge

AnswerCrossword Clue
SLUDGEMuddy sediment.
sludgemud, mire, or ooze
sludgeto cover with a muddy deposit
SLUDGEThick, messy substance
SLUDGEScum
SLUDGEDrain blocker, sometimes
SLUDGESTP target
SLUDGECrankcase sediment
SLUDGEOoze
SLUDGEDredge uptake
SLUDGEMire
SLUDGEOoze.
SLUDGEOozy stuff
SLUDGENew sea ice.
SLUDGEBroken drift ice.
SLUDGEDrift ice.
SLUDGEMuddy deposit
SLUDGEPlumbing nuisance
SLUDGEEngine gunk
SLUDGEIcky stuff
SLUDGEGunk
SLUDGEMuck
SLUDGEDrain blocker