I have bought Windolene as per Swanny's web page, but it doesn't contain (at least in UK) any ammonium.
You can check the ingredients on http://www.rbeuroinfo.com/ and they are as follows:
Aqua, Propylene Glycol Butyl Ether, Methoxyisopropanol, Lithium Magnesium Sodium Silicate, Carbomer or Polyacrylic Acid, Sodium Hydroxide (no mention of Ammonium)
the only window cleaner I found that appears to contain in amongst all the other staff
" Ammonium hydroxide" is Mr Muscle Lemon Window & Glass (you can check it on http://www.scjproducts.info/)
on the other hand has anyone got any experience of using Jeyes Kleen Off ? This is supposed to be 9%
Ammonium hydroxide.
best rgrds Chris