Does anyone have any longer term fixes for sticky antenna masts. The antenna on our 300TE is the most troublesome. I can clean it with WD40 and it will work for a short period but then soon gets contaminated and sticks again. Country journeys are more prone to causing problems. In this situation the mast gets a very slight bend (not kinked), presumably due to its position at the side of the wagon where the air velocity would be high. This occurs even when travelling at legal highway speeds of only 110km/h. The antenna on my 190E has not yet given trouble, being mounted with a rearward angle and presumably less affected by high air velocity around the side of the car, although the similarly positioned antenna on my father's 124 E320 coupe does occasionally give trouble. Is there some means of cleaning the mast and lubricating it that will not attract more contamination?

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107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.