Unfortunately I also had repeating issues with leaking APC bottles.
The first time was a couple of month ago. I didn't think much of it and changed my APC to an empty Green Wheel Cleaner bottle I wasn't using anymore. Last Sunday I noticed that also this bottle was leaking. After having read this thread I took a closer look and saw that it is cracked at the seam at the side of the bottle half way down so that half of the bottle leaked out.
As a result I know now how dirty our carpet is: The APC created a nice white spot (although it was diluted 50% with water)
What is not so funny is that we have a very curious dog and I am worried she may lick it from the floor one day. Hope she is clever enough not to.
Are the Kwazar bottles more resistant to APC?