'organic' nursery disinfectants

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Hello everyone!

Can anybody point me in the direction of research regarding the use/effectiveness of 'natural' disinfectants like lavender, eucalyptus or ti tree oils, or lemon juice in a nursery situation?  I want to use them instead of bleach for pot-washing & other nursery cleaning.  I'd also appreciate any anecdotal evidence, and other suggestions.  I have to create an accredited nursery (typical industry standards) & want to do it without any synthetic chemical products.

Thanks,

Carey