Just to chime in...
When Mike Lambert originally posted his question I was on my phone. I don't like to type on my phone. Now I'm behind a
full size keyboard.
Here's the deal when it comes to car washes. Like I originally stated, what type of car wash is "good or bad" depends on the LSP or Last Step Product on the paint.
My guess, (and I hate guessing or assuming), is the context of what Mike Lambert is asking about is car washes for ceramic coated paint.
If this is correct, then my take is the type of car wash you want to use is a straight, dedicated cleaning only car wash. You simply want to clean any dirt and road grime off the paint finish and leave
NOTHING behind on the surface.
Why?
Because if you use a car wash that also contains a wax product, or some other glossing or shine ingredients, then what you're doing is putting something ON the coating and thus getting the benefits and features of the ingredients or substance being left on the paint
INSTEAD of the benefits and features of the actual paint coating.
The "issue" with this is, in most cases the reason you installed a paint coating or
PAID to have a paint coating installed on your car is to get the benefits and features of the coating. Using a car wash that leaves something behind defeats the original purpose or choice of LSP.
Make sense?
The exceptions would be...
SiO2 Car Washes
There are some car wash options that claim to leave behind SiO2 or some other form of "nano size particles" of protection or water beading ingredients that in theory compliment the coating on your car. I've used a number of these and actually like as they do seem to work.
My concern is if you always use this type of product you'll get a build-up of the magic voodoo ingredients and this could be a negative, not a positive result over time. I think a better idea would be to interchange car washes. One time use a dedicated simple car wash that only cleans, the next time use the enhanced booster wash, then go back to the simple wash. In theory, this would prevent any type of build-up.
Wax-Enhanced Car Washes
If you use a conventional car wax, for example a Carnauba Car Wax, (of some other form of "wax" based ingredient). Or if you use some type of synthetic paint sealant to protect your car's paint - then using some brand of car wash that somehow magically leaves behind some kind of wax or synthetic protection ingredients can be a good thing if it actually works and maintains or enhances gloss, shine, water beading and/or protection.
It kind of goes to what I've been saying in the car detailing world for decades,
"Find something you like and use it often"
At the end of the day, if you're happy... that's what's most important when it comes to keeping your car clean an shiny.
