Deer can be a terrible nuisance, but they are beautiful. In my last house, the garden adjoined a field and woodland with no fence, just a shallow ditch. I got muntjac, normal fallow and black fallow deer, all munching away merrily on the flowers and veg. I also got bitten by ticks; VERY dodgy, as they carry Lyme disease. The doc tested me and luckily it was negative. Our present house has a fence!
Like all 'deterrents', the wee idea might work for a bit, but all creatures become accustomed and ignore such things. Maybe if one changed the donor regularly?? (Sign at gate:- Gentlemen, please wee in this bottle. Thank you.")