I used Autoglym fine on mine. I did the following. Pulled out all the slack and submersed (sp) the belt into a bowl of warm water. Then i sprayed on the Autoglym. Then basically wroked in the shampoo, by squeezing the belt in your hand, and running your hand down the belt still sqeezing, (your GF might be good at this??!

) Then i got an old drying towel and dried best i could. Left them plugged in over night and during the day, and they dried perfect in the summer. Came up as new, i was well chuffed as they were proper grubby