Here, we do use lemon grass infusion to kill bacteria on surface of skin.  But lemon grass has many uses.  Lemon grass is abundant and cheap.  Have a look at this link.

"The citral and limonene content in lemongrass oil can kill or stifle the growth of bacteria and fungi. This will help you avoid getting infections such as ringworm, athlete’s foot, or other types of fungus. Studies in rats have proved that lemongrass essential oil is an effective antifungal and antibacterial agent. Take advantage of these lemongrass oil benefits by making your own body or foot scrub- you can find the recipe below."

http://draxe.com/lemongrass-essential-oil/

Here, we do use lemon grass infusion to kill bacteria on surface of skin.  But lemon grass has many uses.  Lemon grass is abundant and cheap.  Have a look at this link.

"The citral and limonene content in lemongrass oil can kill or stifle the growth of bacteria and fungi. This will help you avoid getting infections such as ringworm, athlete’s foot, or other types of fungus. Studies in rats have proved that lemongrass essential oil is an effective antifungal and antibacterial agent. Take advantage of these lemongrass oil benefits by making your own body or foot scrub- you can find the recipe below."

http://draxe.com/lemongrass-essential-oil/

Aromatic waters of aromatic crops containing traces of essential oils exhibited antimicrobial activities:

Residual water of Satureja thymbra from Greece was as effective as chemical sanitizers in controlling biofilms formation by food-spoilage and pathogenic bacteria Pseudomonas putida, Salmonella enteric and Listeria monocytogenes on open surfaces of food processing industry (Chorianopoulos et al., 2008). Turkey meat products marinated in residual waters of rosemary, sage and thyme retained their spicy, acidic odor and flavor after storage due to lipid oxidation retardation and antioxidant effects of the spice residual waters (Mielnik et al., 2008). Washing of sliced apple and carrot pieces with hydrosols of thyme, black cumin, sage, rosemary and bay leaf for 20-60 minutes protected them from E. coli and Salmonella typhimurium infections (Tornuk et al., 2011).

Chorianopoulos, N.G., Giarouris, E.D., Skandamis, P.N., Haroutonrian, S.A. and Nychas, G.J.E. 2008. Disinfectant test against monoculture and mixed culture biofilms composed of technological, spoilage and pathogenic bacteria: bactericidal effect of essential oil and hydrosol of Satureja thymbra and comparison with standard acid-base sanitizers. J. Appl. Microbiol. 104: 1586-1596.

Mielnik, M.B., Sem, S., Egelandsdal, B. and Skrede, G. 2008. By-products from herbs essential oil production as ingredient in marinade for turkey thighs. LWT Food Sci. Technol. 41: 93-100.

Tornuk. F., Cankurt, H., Ozturk, I., Sağdiç, Ö., Bayram, O. and Yetim, H. 2011. Efficacy of various plant hydrosols as natural food sanitizers in reducing Escherichia coli O157:H7 and Salmonella typhimurium on fresh cut carrots and apples. Int. J. Food Microbiol. 148: 30-35.

Dear Cederic

Please find some paper related with your query.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3873673/

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3950955/

http://jac.oxfordjournals.org/content/47/5/565.full

The essential oils from thyme, clove, mint, tea tree, sandal wood have strong antimicrobial properties. The aromatic compounds such as thymol, eucalyptol, methyl salicylate, menthol, eugenol possess powerful antibacterial activity.