Synonyms for Residue:

adj.

residual (adjective)
sewage, silt, scraps, excess, parings, shavings, scourings, soot, Leavings, trash, study at remainder, raspings.

n.

litter, ruin, landfill, e-waste. remains, dioxin, rust, leftover, crystal, distillate, filtrate, scale, Leavings. dirt (noun)
soot.
leftover part (noun)
parings, debris, silt, scourings, scraps, dross, garbage, slag, Leavings, dregs, remains, remnant, sewage, shavings, remainder, scum, rest, residuum, leftovers, residual, trash, junk, excess.
refuse (noun)
dross.
relic (noun)
artifact.
remains (noun)
Leavings.
residue (noun)
detritus, residual, grounds, debris, sawdust, chaff, afterglow, remainder, rest, scum, precipitate, afterimage, residuum, artifact, Filings, remnant, slag, leftovers, sediment, dregs, dross, vestige.
ruins (noun)
ruin.
waste (noun)
effluent, garbage, despoilment, decay, rubbish, refuse, waste, junk, offal, leakage, Dejecta, slop.

v.

remains (verb)
Leavings.

Other synonyms:

distillate, filtrate, dioxin, silt. excess, rust. crystal, remains. scale. carbon
soot.
rubbish
trash.
sewerage
sewage.
Other relevant words:
leftover, dioxin, landfill, scourings, scraps, e-waste, residuum, shavings, soot, remains, parings, rest, ruin, trash, Leavings, distillate, filtrate, excess, crystal, raspings, rust, residual, silt, scale, sewage, litter.