On my slideout the wiper does not fully deploy/extend when the slideout is extended. This happened before so I replaced that wiper but it appears that the fit is too tight on the wiper and its pinched so it will not slide out. I've applied ptfe silicon grease to it but that is not enough. I wonder if there is an adjustement down below that changes the ammount of pressure that's applied. It seems that there needs to be more opening to allow that wiper to pop out. To be honest this rv has probably had the problem since day one except it was not noticed until a heavy rainstorm and I had the RV tilted slightly the wrong way so lots of water came in.
Here is alink to a good photo.
https://photos.google.com/share/AF1Q...dXdGJzUXdGR0hn
Its not mine but it shows the problem. Only part of the wiper is deploying but toward the middle it is not extended. Its possible to reach under there and pull it out but of course you can't do that every time that you use the slideout. I think its pinched too tightly.