Have you looked into why you need a claybar mate? I'd rather you didn't do damage if you're using it for the wrong reasons.
To remove some bonded contaminants that the wash de-tar/de-iron stage won't remove alone.
No I should add at this stage that clay is brilliant. It does indeed leave surface like glass, but if used incorrectly it's probably the worst thing you can do to your car. The polishing afterwards has to be up to scratch or the paintwork will actually look worse from the marring incurred during the claying stage.