Refinery waste

This time we are looking on the crossword clue for: Refinery waste.
it’s A 14 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: SLAG.

Last seen on: –L.A. Times Daily Crossword – Apr 30 2022
USA Today Crossword – Sep 11 2019
Wall Street Journal Crossword – July 26 2019 – Poets’ Corner
-NY Times Crossword 28 Nov 2017, Tuesday