
1) Ashes
Found on
https://www.crosswordclues.com/clue/residues

1) Bathtub rings 2) Chemical leftovers 3) Chemical remnants 4) Distillery leftovers 5) Rings in a bathtub
Found on
https://www.crosswordclues.com/clue/residues

the very small amounts of pesticides that can remain in a crop after harvesting or storage and make their way into the food chain
Found on
http://www.encyclo.co.uk/local/20736

Secondary metal-containing materials that require smelting to recover the metal, as distinct from scrap which may only require melting and blending.
Found on
http://www.metalbulletin.com/Glossary.html

By-products from processing all forms of biomass that have significant energy potential. For example, making solid wood products and pulp from logs produces bark, shavings and sawdust, and spent pulping liquors. Because these residues are already collected at the point of processing, they can be convenient and relatively inexpensive sources of biom...
Found on
https://www.encyclo.co.uk/local/22831
No exact match found.