I had been using the liquid for several years. Of course, when the computer was dismantled, it was checked, as I wanted to store the components cleaned anyway. Like the previous speaker, I can confirm that it leaves a discolouration. In my case with acrylic tubes. And yes, there were minimal deposits. But for the time I ran the system maintenance-free, I was more than happy with it.

I also matted the tubes myself because I love this milky effect.

I would like to add that I used the product a few years ago and it was good back then. I hope that is still the case. And yes, EKWB is not doing so well in terms of finance and reputation.

Very low - it is a transparent fluid therefore no particles that can clog your system. Still it can stain your tubing if it is coloured liquid.
That said, personally, I decided to replace all the EKWB equipment I had, after the major scandal they were caught in