One nice thing about doing clay is you can do it at night. If you have a garage you can clay the car inside at night and then wax it the next day. Just remember...you MUST wax the car after you have clayed it. The process takes off all the oxidation but also takes off all the old wax as well. Don't leave your paint unprotected.
Here are some suggestions to get the most out of claying your car
1) Wash it first with a kitchen type dish soap to remove as much of the old wax as possible
2) I suggest claying your car in the garage our in the shade to avoid direct sunlight
3) Take a brand new clay bar and tear off around 1/3 of the bar and shape it into a shape that will fit your hand well such as a small panckae around 1/4 inch thick.
4) Use plenty lubericant on the area you plan on claying.
5) Only clay a small area at each time. If you notice dirt in the clay fold it back into a ball and then reshape it again and keep claying
6) When you start claying an area you will notice some slight resistance as you move the clay bar back and forth or in a circular motion you will notice it will start moving easier as it removes the debris from the surface of the car. When the surface feel like glass as you move the clay bar back and forth that area should be clean
7) If you happen to drop the clay bar on the ground or any other dirty surface throw it away and tear off a new piece. Othewise you could scratch your paint if there is debris or major dirt in the bar as you rub it back and forth
8) When you are finished claying just wipe off the residue with a microfiber type towel and begin to wax your car
Even brand new cars need to be clayed in most cases.
I picked up the Ice Liquid Clay Bar over the weekend. It's not bad for removing old wax, dead bugs and tar, but it really doesn't and shouldn't replace a good clay bar. I would recommend it for a quick clean up.