I have 3 lemon trees that produce for too many lemons for us to use. My sil said if you mop with lemon juice it keeps spiders away. I havent tested that yet but what I want to know is:

Is lemon juice antibacterial?
Does it go mouldy if used? eg I dont want a nice lemony clean floor one day and a green moss patch the next.
Does the citric acid eat away at things like paint or varnish?

If anyone know please fill me Thanks