Why don't you do as others have suggested here and use IR lasers? They'll temporarily blind the cameras even without being pointed right into the lens, and are completely invisible to humans, so even if the police were called, you can easily claim they are just LED's (Making sure they don't look into them). You can get IR laser diodes for real cheap on eBay that'd do the trick. They don't even need to be high power to basically disable the cameras.
As others have said, water isn't likely do to anything in the short term except make him aware you're attacking his property, whereas a tiny IR laser on your balcony won't raise any flags unless he moves the cameras.
For the best effectiveness, set up a simple circuit to flash the laser at about 5hz. IR cameras like those usually have exposure compensation, so by pulsing the bright light, they'll never be able to adjust properly.
This method is best because you are not actually damaging any of his personal property, so you don't have to fight that off in court if it ever comes to it.
As others have said, water isn't likely do to anything in the short term except make him aware you're attacking his property, whereas a tiny IR laser on your balcony won't raise any flags unless he moves the cameras.
For the best effectiveness, set up a simple circuit to flash the laser at about 5hz. IR cameras like those usually have exposure compensation, so by pulsing the bright light, they'll never be able to adjust properly.
This method is best because you are not actually damaging any of his personal property, so you don't have to fight that off in court if it ever comes to it.
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