All claybars in the US are made by the same company. They are the only one that has the copyrights as of right now. There are different levels of aggressiveness and sizes available.
I recommend taping off vinyl stripes and decals just to be on the safe side. You mainly have to be careful on the edges. If they do get oxidized, you can polish them to get them looking good again. You can also claybar them without a problem.
I mainly use 5.5 inch pads to do a vehicle. For tighter areas I use a 3.5 inch or 4 inch pad.
It really depends on what kind of condition the paint is in on how many pads you will use. On a car that is in pretty decent shape I could use 3. There have been some cars where I've had to use 10-13 pads. To clean them you can spray on an all purpose cleaner and do them by hand or you can throw them in the washing machine using normal detergent.
As far as how aggressive a pad you use depends on what kind of condition the paint is in. I always recommend starting out with the least aggressive method first and then working your way up if needed.
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