I'm sure this has been covered here before. Unfortunately I'm an old guy newB who's pretty search function challenged. First - How do you determine when your clay bar is too contaminated to use?
Another way to think about this would be...
After washing your car and you feel the paint, if it doesn't feel like #40 Grit Sandpaper, or like concrete, that's a pretty good indicator that it's not "super" horrific contaminated and therefor won't fill up your clay bar with contaminants as fast as a finish on a car that is parked outside 24 hours a day, 7 days a week and hasn't had any appearance maintenance for 15 years.
See the difference?
Here's another example, my dad owns a 1965 Ford Thunderbird Convertible and my best friend owns a 1956 Ford Thunderbird Convertible, both cars are parked inside garages 24 hours a day, 7 days a week. The only time they are driven is on sunny days to car shows. For these reasons, they paint never gets very contaminated and if either owner clays the paint the clay bar won't become very contaminated.
Now if they clay their work trucks, (both guys are Ford guys and have Ford F150s that are parked outside all the time), the clay bars used on the trucks will fill with contaminants much faster and therefore not last as long.
So you can gauge how contaminated your clay bar will become by gaging how contaminated the paint is to start with, this is just a "Big Picture" method of measuring but hopefully the point makes sense.
Besides that, common sense is what I use... when claying a cars finish, if the clay looks visibly contaminated, and I knew before I started that the paint felt like #40 grit sandpaper, then I know the clay bar is going to be loaded with contaminants and should be replaced before working on any future projects.
Second - Is there a cleaning method to render them reusable when they get too contaminated? The Two Guys Garage segments are well done and very helpful. :dblthumb2: Ric
There is no way to clean clay to make it resusable. Great idea! Just not sure the technology exists and even if it did it would be less expensive to just buy new clay.
Also for any lurkers, there's the Two Guys Videos and then there's the extended version we filmed here at Autogeek's Show Car Garage...
How to use detailing clay to remove "Above Surface Bonded Contaminants" and restore a smooth as silk surface.
Part 1 - How To Use Detailing Clay
[ame=http://www.youtube.com/watch?v=gfxAesk4Po4]YouTube - Part 1 - How to use detailing clay[/video]
Part 2 - How To Use Detailing Clay
[ame=http://www.youtube.com/watch?v=opfK408uIxM]YouTube - Part 2 - How to use detailing clay[/video]