Just a thought, if the cats are ignoring the spray bottle, try canned air.  I have a barn cat turned house cat that LOVED (seriously) get doused.  One day I was cleaning computer keayboards and zapped him with it.  All it takes now is to tap the can and he becomes a model citizen...at least for 30 seconds!  
I also use tape sticky side up to keep the little darlings out of large flower pots and off things they shouldn't be on.
			
			I also use tape sticky side up to keep the little darlings out of large flower pots and off things they shouldn't be on.