This ultra sonic cleaner just reminded me of a tool that I sometimes use during brake bleeds. An old electric toothbrush (minus the brush). I touch the calliper, hoses and master cylinder with it to free up some micro bubbles. I have no idea if it works …but my OCD improves.
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Then I have bigger problems then OCD.
I also use the wife’s toothbrush for derailer cleaning and carefully put it back in the holder.Just had a bollocking from the wife for emptying petrol in the garden after doing a deep clean of the drive train.
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
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