most washing powders/detergents are sodium based.... I can have greasy dirty hands, go for a surf and they come out sparkling clean ;)
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Yep dish washing liquid removes the waxes from the vehicle (including inside the panels where you can see) and the Sodium content increases rust potential behind seals and in cavities.
Rainx windscreen additive should really only be used with a RainX treated windscreen.
Never had bubbles etc when using it.
Bars Bugs is ok.
The best part of the RainX windscreen is bugs wash off easier, and no need for wipers in the rain ;)
When the water is just beading away vision is much clearer.
I've driven in torrential rain with and without treated glass and the treated is so much easier to see out of. The water doesn't spread, it just moves off the glass.
A wiper sweep takes time, leaving vision to focus between sweeps.
Think of it something like an old bonnet and a freshly waxed one.
The older one, the water sheets away - the freshly polished one, as you add water is beads away quickly.
Since bugs are the topic did you know that a 60/40 or 70/30 mix of Hydrogen Peroxide mixed with water in a spray bottle will dissolve bugs in a few seconds?
Simply keep it in a dark spray bottle (I use a regular spray bottle and have duct tape around it) so it doesn't go off, and before washing the vehicle (or at any time the bugs are too much) spray the mixture on the bug residue and watch them turn fizzy white before an easy wipe off with a micro fiber cloth.
Will not hurt paint/glass/rubber/plastic or anything else that I know of. I keep a bottle in the motorcycle pannier and the D3.
You won't be disappointed. Hydrogen Peroxide is available from the chemist.