Koch Chemie MZR Mehrzweckreiniger

When we first got our hands on the Koch Chemie MZR Mehrzweckreiniger, our first thought was, "Alright, another all-purpose cleaner." But to write it off as just that would be a serious disservice. After putting it through its paces in our own workshop and seeing it used by countless professional detailers, we’re genuinely impressed. This isn't a jack-of-all-trades and master of none; it's a brilliantly engineered, highly versatile concentrate that deserves a spot on any shelf, from the weekend warrior's garage to the pro's detailing bay.

So, what makes this Koch Chemie multi-purpose cleaner stand out? For us, it comes down to three things: versatility, economy, and intelligent formulation.

Let's talk versatility first. The "MZR" stands for Mehrzweckreiniger, which literally translates to "multi-purpose cleaner," and it lives up to the name. We've used it effectively as a powerful interior cleaner for plastics, rubber, and vinyl on dashboards and door cards. Diluted differently, it becomes an excellent engine bay degreaser, cutting through light grime without being overly aggressive. It's even effective as a pre-wash agent or for cleaning wheels and tires. This wide range of applications means you're effectively buying several cleaners in one bottle, which is a huge win for anyone looking to streamline their product arsenal.

This leads directly to our next point: economy. Because MZR is a concentrate, a single litre bottle makes gallons of cleaning solution. The dilution ratios are key. For light interior cleaning, a 1:20 mix is often sufficient. For tougher jobs like degreasing an engine bay or cleaning heavily soiled car mats, you can ramp it up to 1:5. This adjustability means you're never wasting product or money on a premixed solution that's too weak or too strong for the task at hand. In our opinion, the value proposition here is exceptional.

Finally, the intelligent formulation is what truly separates it. Koch Chemie has a reputation for serious chemistry, and it shows. MZR is a high-alkaline cleaner (approx. pH 12.5)—which means it cuts heavy grime fast when diluted correctly and rinses residue-free. Because it’s strongly alkaline, avoid delicate surfaces (e.g., leather, infotainment screens, sensitive trim), spot-test, and use interior-safe dilutions. For these we would recommend their dedicated ph neutral cleaner Koch Chemie Pol Star

Our verdict? The Koch Chemie MZR is a foundational product. It’s the workhorse you’ll reach for constantly because it just works, it’s cost-effective, and it’s safe. It might not be the most glamorous product in their lineup, but in our view, it’s arguably one of the most essential and practical car cleaning concentratesavailable. A true testament to German efficiency.