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Most toilet cleaning fluids here in Denmark contains acid. Some also contain bleach.

The acids used are either phosphoric acid, citric acid or hydrochloric acid. I avoid the two latter acids (and bleach). While phosphoric acid is as effective as the other acids, it is far less aggressive to aluminium.


I Never use caustic soda. I find it far to aggressive. Both to aluminium and to my skin..



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I use TSP or tri-sodium phosphate, it seems to be about right for soft metals including cleaning wood for refinishing, I think that is what Twinsport is speaking of. I get it in small paper milk cartons in powder form. BTW they sell a 30L ultrasonic cleaner that is 22x13x12 (LxWxH) that may do most engine blocks

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