i was just gonna say thisI use Fog X, its the sister product to Rain X
That's why I've always used washing up liquid, spread on thin then polish off with kitchen towel, works a treat!
I use Cat Crap on all of mine...
That idea stinks Washing up liquid doesn't contain actual grains of salt which will scratch plastic, it contains soluble salts.
Wasn't aware that I mentioned anything at all about washing up liquid containing salt