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In order to eliminate the accuracy deviation of the optical diameter measurement system (ODM) induced by glue and dust buildup, a filter rod cleaning unit was designed and fixed on the input component of the ODM. The unit is composed of a seat and a cover, which define an annular chamber and an annular jet. After being introduced into the annular chamber, the compressed air flows out of the annular jet, forms an air stream flowing in the opposite direction of the moving filter rod. A simulation model of the cleaning unit was created with Comsol software, and the dimensions of the unit were optimized to allow the air stream evenly swept over the surface of the filter rod at maximum flow velocity. The designed unit was tested on three KDF4 filter rod makers in Qujing Cigarette Factory of HongyunHonghe Tobacco (Group). The results showed that the filter rod moved stably, and the average value and standard deviation of the filter rod circumference were not affected. The monthly average number of ODM cleaning reduced from 64 to 5 per KDF4 filter rod maker. This technology supports the improvement of the operating efficiency of filter rod makers. [ABSTRACT FROM AUTHOR]