I take a more preventative approach and have a screen of fine wire mesh covering my radiator. Think old fashioned back porch screen door material.

It doesn't keep out the finer dust particles, I'm sure, but keeps the bugs and larger road detritus out.

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.