My stock vacuum wipers stopped working the other day. Not a big problem since my top is off and I try not to drive it on days when rain is forcast. I determined that I had plenty of vacuum and that my on/off valve was working. I next took apart my motors. The problem was the air inlet nozzles. They were full of some kind of packing and bugs. I just cleaned them all the way out and reinstalled them. They now work great. Is there some kind of filter type thing supposed to be packed in the inlets? And how much damage can be done if I don't put anything back in? The only trouble I can forsee is more bugs or critters getting in side again. I don't think enough dirt and grit will get sucked all the way thtough the system to cause vacuum pump failure. I don't know, so that is why I am asking. Thanks.