I cleaned mine this past week, I used the FJC brand of A/C evap cleaner and odor control. I had to take off the cabin filter tape the hose from the can to a dowel rod and insert in the two openings and put half the can in each side. then ran AC on high to pull foaming agent into lower ducts. It has helped a great deal.

the directions for the cleaner was to spray in the drain tubes inserting the spray tube until it touches the evaporator and spraying for 20 seconds. with where the e53 drain tubes are located and routed it is difficult to reach with the length of hose provided.

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"Seems people always have time to do the work twice but never enough to do it right the first time."

2003 X5 3.0i
2003 LS430