Wash successively in alcohol, xylol, ether, and alcohol, to remove the last traces of grease.
"The Elements of Bacteriological Technique" by John William Henry Eyre
By dropping water, toluol, xylol, etc.
"Histology of the Blood" by Paul Ehrlich
Xylol, used pure, or with the addition of five per cent of vaseline, is also very efficacious.
"Handbook of Medical Entomology" by William Albert Riley