What is a clay bar?
Clay bars seems to be the big thing at the moment, everybody is talking about them, which may explain why there are so many misconceptions about them! Hopefully I can clear up a few things in this article.
The story goes that some Japanese chap discovered that he could take riverbed clay and clean his car with it… however, you are unlikely to find a real clay bar on the market. The ones you can buy are plastic and pretty much made of the same stuff as Blu-tac, only blended to be stickier and harder. The basic idea is that you rub it over your car’s paintwork and the stickiness sucks up any contaminates such as raildust, fallout, overspray and organic matter. So it does ‘clean’ your paintwork, but some people are under the misapprehension that it will polish paintwork and can be used to remove swirl marks and scratches - it doesn’t.
Can they harm my car?
If you don’t use them properly - you bet they do! You are rubbing them reasonably firmly all over your car, so if you get any bits of grit in them they will cause scratches. You have been warned!
The first rule of using a clay bar is not to use it until you have got your car really clean, I mean really clean! Don’t cut corners, clean right under those sills, all the shuts and panel lines, gutters, trim, everything! Many people take great care not to drop the claybar on the floor (which is rule two) only to pick up a bit of grit which was sitting in some nook or cranny on their own car. They then proceed to rub this all over the paintwork and wonder where they went wrong.
Rule two is to take great care never to drop it on the floor. Any dirt and grit there will stick to it and stay in the clay. There is no point in trying to pick it out, it isn’t worth the risk - throw the clay bar in the bin.
As you use your clay bar, it will pick up dirt and grit, but this is okay, this stuff is so small it will cause minimal scratching. In theory, at some point the clay bar will get so full of dirt that it will need throwing away… but I have known this to happen because somebody always drops it on the floor before then! They last for ages and are a really good investment (unless you have butter fingers).
Clay bars come in a variety of different grades, many manufacturers producing 3 or 4. But most of these are professional use, being medium and heavy duty for removing serious fallout prior to buffing a car. The ones most commonly aimed at the general public are very soft and designed not to damage paintwork and are good for general cleaning of paintwork. When using them for heavier duty contamination removal, it is sometimes unavoidable to scratch the paintwork and doesn’t matter much to the professional as they will have the tools for removing light scratches.
But you don’t need to be a professional valeter to make use of a clay bar. There is all sorts of stuff that gets onto your paintwork and sticks there, from road salts, lime scale, soot, light metal fallout and organic material such as squashed bugs and tree sap. A claybar will remove the stuff that a sponge or wash can’t– If you try it you will be amazed, both by the stuff on the claybar and how smooth your paintwork feels.
How to clay bar your car.
First I recommend getting a bucket of warm water. The bucket needs to be spotlessly clean (no grit in it!), and the water needs to be nearly hot, this is because you put the clay bar in the bucket to let the water soften it. Once you have left it for a minute, take it out and knead it into a ball and then flatten it so you have a palm sized disk. Some people cut theirs into slices and use only a bit at a time… I have no idea why they would do this, it seems silly to me. Just use the whole lot in one go.
If you buy a clay bar, detailing clay or paint eraser, it will probably come with a bottle of clay lubricant, you can use this by spraying first the clay bar (so it doesn’t stick to your hands, and then on the part of the car you are going to clean. If you didn’t by a clay bar aimed at the retail market, then you can buy clay lubricant… but frankly, You don’t need it. I had a conversation about this the other day with a manufacturer, they told me that the clay lube does contain lubricants and some wax to help shine things up a bit, but really its nothing special, normal car shampoo (mixed with water according to the instructions) will do just as well, but the manufacturers feel compelled to provide a lubricant in order to ensure that you have something that won’t react with the detailing clay. Some soaps and detergents can cause a breakdown of the clay bar, so ensure you use a shampoo as these are PH balanced and suitable for cars and clay bars.
When you start off pushing the claybar across your paintwork, you will at first feel a slight resistance. This may because the claybar isn’t yet flat, and it may be because it is sticking against the fallout. but once you have made a few strokes, it will get going and you will feel the difference between dirty paint and clean paint that the clay bar glides smoothly over. I suggest that you move the bar in straight lines back-and-forth, you don’t need to press hard, in fact it’s better if you don’t, that way you can feel better. They say that you can tell when the paint is clean because you will hear it… it is literally squeaky clean - but this isn’t always the case. Check the bar often to see how dirty it is, check for anything that looks like grit, and check the paintwork for scratches. Once you have done a couple of square feet, fold the claybar in on it’s self, roll it up into a ball and flatten it again, and start with a clean face. This will minimize the chances of grit and dirt in the claybar damaging the paintwork. Every now and again, you feel a bit of resistance which is caused by some fallout, and although you might not be able to see it you know there is something there- once it’s gives way and has been sucked up by the claybar, fold it up again incase it was something that could scratch. Keep the car, the bar and your hand lubricated at all times, it will make things easier.
If you have a light coloured clay bar, you will be able to see all the crud that is coming off really clearly. I have covered fallout and raildust in other articles, but much of the stuff you are seeing is just everyday grime from pollution that normal washing can’t remove. This stuff harbours all sorts of acids, salts and other stuff which is harmful to your car. Unfortunately, car paintwork is porous, so you are only removing the rubbish from the very surface, which is why we always recommend applying a sealant such as Supagard or Diamondbrite to your car from new.
Once you have clay bared your car rinse it off. You will probably want to polish it, and you will certainly want to wax it, but you will now notice that the car is silky smooth.