I dont know is the newer MLs have it or not, but the grommets that hold the pump on can be swapped over to BMW parts, which have filters built into them, this prevents debris being sucked and impacted into the nozzles and hoses.

I also now use distilled or RO water to fill the washer tank and put some methanol in it to keep bacteria away and the filters have kept everything working so far.

however - I found a huge load of blue mineral deposit in the washer tank walls of my W210. - it also was missing an NLA part near the nozzles which I sourced from BMW too.

The deposits were from the leaking thermostat O rings in the coiled heating element.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)