Green’s Dictionary of Slang

1. to get rid of, to remove [wipe off, to erase].

1859		Hotten Dict. of Modern Sl. etc. 117: WIPE OFF, to pay one’s debts — in allusion to the slate or chalk method of account keeping.
1864, 1867, 1870		Hotten Sl. Dict.
1873		Sl. Dict. 341: Wipe ‘to wipe off a score,’ to pay one’s debts, in allusion to the slate or chalk methods of account keeping.
1936		‘Banjo’ Paterson Shearer’s Colt 128: He’s got to wipe that off somehow, even if he has to wipe off Red Fred.
1946		Worker (Brisbane) 15 Apr. 15/3: The wiped-off wives need not look for much help from America.
1947		F. Brown Fabulous Clipjoint (1949) 74: Wipe off that grin, you dope.
1981		W.D. Myers Hoops 20: If I had been playing the sucker seriously, I would have wiped him off the court.

2. (Aus.) to bid a last farewell, esp. to a place [wipe v. (5)].

1984

Partridge DSUE (8th edn) 1344/1: since ca. 1925.