This section is from the book "Materia Medica And Therapeutics Inorganic Substances", by Charles D. F. Phillips. Also available from Amazon: Materia medica and therapeutics.
Dilute acetic acid is used by some practitioners from the commencement of this fever in all cases. Freely diluted, it certainly makes a grateful refrigerant drink. Where the eruption is more or less suppressed, a teaspoonful of vinegar given in sweetened water every two to four hours for a few doses, is said to cause diaphoresis, and to assist in bringing out the rash: however this may be, sponging the body with hot vinegar and water twice or thrice daily is often useful.
Dr. J. Dougall specially recommends the aromatic glacial acetic acid impregnated with neroli, rosemary, etc. - 1 dr. to the oz. of water is used for sponging, and some is volatilized in the sick room (British Medical Journal, ii., 1879).