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Crud, 4 letters

Drain stuff, 4 letters

Engine fouler, 4 letters

Goo, 4 letters

Greasy dirt, 4 letters

Greasy glop, 4 letters

Greasy residue, 4 letters

Icky residue, 4 letters

Icky stuff, 4 letters

Messy stuff, 4 letters

Muck, 4 letters

Slime, 4 letters

Slimy crud, 4 letters

Slimy stuff, 4 letters

Slop, 4 letters

Sludgy stuff, 4 letters

Sticky matter, 4 letters

Sticky residue, 4 letters

Sticky stuff, 4 letters

Thick, messy substance, 4 letters

Unwanted buildup, 4 letters

Any thick messy substance, 4 letters

Toxic assets that pay for cleaning out sinks?, 9 letters

Pollution legislation?, 11 letters

Use of steel wool, e.g.?, 11 letters

Cleanliness legislation?, 15 letters

Subject in which sludge is studied?, 11 letters

Covered in goo, 5 letters

Full of crud, 5 letters

Goo-covered, 5 letters

Gooey, 5 letters

Hard to clean, maybe, 5 letters

Like grease, 5 letters

Needing a good cleaning, 5 letters

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