Wasted money & unfair effort, it didn't clean anything, over half an hour and after the engine reached temperature (started 2-3 times and the fan), it didn't clean almost anything, all the stains-rust in their place, not even the walls from the expansion/filling tank were cleaned!

I used it in a car to flush the system with distilled water.
After flushing for about an hour (with the engine running), when I emptied the circuit, it released some residues like little scraps that didn't come out initially when I emptied the old coolant.
Then I filled the circuit with new coolant.

By mistake, I put about 50ml of engine oil in the water radiator. With this cleaner, the cooling system cleaned completely.

Unacceptable for Liqui Moly
I bought this product 4 times to properly clean the radiator (because I had a problem with a clogged heater in the cabin..)
• The first time I trusted Liqui Moly..
• The second time I thought I did something wrong with the product.. And it was my fault..
• The third time I thought it can't be.. I followed all the instructions.. And still nothing..
• The fourth time I gave it one LAST chance for the product to work.. AND STILL NOTHING..
Wasted money on Liqui Moly
I bought a cleaner from Holts and it cleaned my radiator immediately.. FINALLY A WARM CABIN..

It couldn't unclog a problematic refrigerator with a thick issue, but the rest of the circuit worked perfectly.

I have a serious issue with the radiator, it is full of mud and salt and it doesn't produce any warm air.
I used this product, of course I didn't see any difference in heating, I give it 1 star and declare that it is completely useless, because it doesn't do anything it promises, I removed the water collars and they were full of salt and dirt.
In short, okay the radiator's fridge didn't clean it, it needs a professional, etc, etc, it didn't even clean the pipes.
Money wasted.

The watermelon is bad, in a car with mud in the circuit, even though I had emptied it and filled it with clean water, it did nothing more than if I had put plain vinegar.
In a few words, in clean circuits, it may show something, in muddy ones it does nothing. And because I see reviews that say different things about various products, wow!!! Have you tried them, or are you just writing nonsense? And if you have tried them, have you tried them properly? And for the job they claim to do, don't blame others if you don't use them correctly, because some people think that if they pour STP, the engine won't need repair and it will become new