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I was just wondering, can I use something like Fairy washing up liquid or dish soap (which is added to hot water in a sink or basin to wash plates, dishes and cutlery etc)) in warm water to wash my 2003 Opel Agila in Arden Blue?
I'd use two buckets and two sponges and then apply this wax afterwards.
Will this ruin my paintwork if I wax it afterwards?
Using dish washing liquid on your auto paint will strip off any of the good "stuff" which is on there, such as waxes and or oils. This leaves it unprotected. If you use stuff specifically for washing your car, you'll leave the wax in place and it will last much longer between applications.
This site says it pretty well:
While the detergents in dish soap do a great job cleaning the car ... they also remove much more than just the dirt from the surface. The detergents break down the wax, stripping it away and leaving your paint dull and unprotected.
Good car wash soap will not contain any detergents and will be rich in lubricants (which safely lubricate the dirt, allowing it to glide from the vehicles paint). A “feel test” you can use to test your car wash is to put a small amount of it between your finger and thumb and rub it back and forth. You will notice that better car washes will be much more slippery. Lesser ones may contain detergents to “help” clean the car (since the lubricants aren’t there), so make sure you check that before buying.
EDIT: To answer your real question, though, it won't ruin your paint work, but will leave it dull and lifeless. You will have to rewax every time if you expect it to look good and stay protected. I'm not sure why you'd want to do this when you can just use car wash instead and not have to worry about the wax every time you wash your vehicle?
The problem with using dish soap on your car is that it tends to wash away any wax that might be on the surface. Wax not only makes the car shine - it also protects the paint to a degree.
So, will it hurt anything? Not that I'm aware of, but if you wax your car or use any other protectants, it would be best to stick to an actual "car wash" liquid.
I would never do this for a regular wash.
However, there is one time when you might want to use dish soap to wash the car: when you're getting ready to do a really good waxing. While the dish soap will remove all of the wax that you used to have on the car, it will also strip road grime, oils, bird crap and a lot of other nastiness. The surface that remains will simply beg for wax and more wax.
Full disclosure: I don't do this.
When I really want to get everything off, I use a clay bar and wash with car soap a couple of times. However, I have seen this done with a really good waxing afterwards and the car looked very pretty.
Fairy could not manage to wash out wax from my micro fibre towels , even when I used boiling water with it.
Even breaks cleaner spray did not manage to strip of wax from my car easily , it took realy hard rubbing and respraying of same spot.
