I am a great fan of Griot's Garage products. They make a range of car cleaning and finish-maintenance products which work well and which, of equal importance, I feel are safe to use on my car. Based on my experience with their products over years, I use them with confidence that they do not contain harsh chemicals which will damage the finish of the paint, leather or plastic surfaces of my car. They are expensive, but I think worth it for the additional peace of mind in knowing that they are effective and safe for the finish.I am just as pleased with the Paint Cleaning Clay Kit which consists of the Speed Shine Cleaner/Lubricant and the Paint Cleaning Clay.  Even if you think that your car's surface is clean, you will often find out that it is not when you start cleaning the surface further with clay.  The clay lifts off tiny particles of contaminants that have sealed to the paint (tree way, etc.) and which can't be seen, but which can often be felt.  In some cases they can't even be perceived as much while they are there, but you definitely notice the slicker surface once you use the clay.  It is like having your teeth cleaned at the dentist's - you had forgotten they could feel so smooth.  The clay lifts these particles off leaving a much smoother, cleaner surface.  Just like a cleaning at the dentist's, I clay a car once a year or so, not every time I wash the car.The Griot's clay will get under you finger nails, so you may wish to use gloves.  Griot's also makes an applicator pad which can be useful as it holds the clay in the center of a foam ring which, when sprayed with Speed Shine, applies a layer of the Speed Shine as you move across the car's paint.  I have used the version of that product which fits on a random orbital polisher, but I prefer to use the clay by hand as I often found the clay losing grip in the sponge applicator and flying out if I made the mistake of lifting the orbital polisher off the car while it before it had completely stopped spinning.  As well, I have experienced it falling out as well from time to time if the speed shine had coated the clay surface that you are trying to stick into the pad applicator surface.  The clay becomes too slick to grip.One word of warning in this regard which should be obvious - if you drop the clay onto your driveway, you should throw it away as it will have picked up rocks and other items which will scratch your paint.  I recommend that you don't try to salvage it as it may contains grit and sand that you can't see to pick out.In addition to making good car care products, it also may be useful to some to note that Griot's is also good at sourcing and selling hard to find or extremely useful tools. I have purchased many over the years (e.g. solid, machined aluminum, lifetime water hose sprayer, no-drip caulk gun, a cam-locking separator gate for truck beds, etc.).