Meguiars seem to be common as it is easy to get. Try this https://www.bilthamber.com/waxes-polishes-and-clay-bars/auto-clay
You are right for pointing out grit guards, for all buckets. IMO. Cheap skate way was a cut colander. https://www.youtube.com/watch?v=2gnNkbVa9OI
@lynx started
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Meguiars seem to be common as it is easy to get. Try this https://www.bilthamber.com/waxes-polishes-and-clay-bars/auto-clay
You are right for pointing out grit guards, for all buckets. IMO. Cheap skate way was a cut colander. https://www.youtube.com/watch?v=2gnNkbVa9OI