I hate waste and am always looking to re-use, recycle etc wherever possible. I also only use natural cleaning products, so the glut of citrus fruit recently has been a real bonus to my cleaning supplies in the form of Citrus Enzyme Cleaner.
Left over citrus peels mixed with warm water and sugar and left to ferment for 3 months. I put mine in a clip-top jar because it’s easy, and you have to release the gases twice a day for the first few weeks, otherwise it’s likely to explode, without letting too much air in which will cause the mixture to go mouldy. Just releasing the clip twice a day without opening the lid achieves this perfectly.
After a couple of weeks, or when the mixture calms down put it in a dark warm place to ferment further, I usually leave it until I need to use it, minimum 3 months, and then strain into a spray bottle
Although this is called “Enzyme” cleaner, there are probably no enzymes in it al all (Wendy Howard gives a good account of this on her blog ‘permacultureinportugal’) but it’s likely that the fermentation produces an alcohol based solution, in any event, it makes a wonderful, non-toxic cleaner for just about everything, and it smells great.
I’ll going to add a few drops of tea tree oil and lemon eucalyptus oil to the next batch and use it spray the animal housing to deter flies and mites.