I am having trouble removing the glue that is left on the walls after I removed the wallpaper. I have been working on the same area (approx 4 x 4) for over an hour maybe 2 and there is still glue there and I am starting to ruin the drywall. The original builder did not really paint or size the walls, they just stuck it over the drywall.

Anyway I have tried DIF, Fabric Softener, Warm Water, TSP, scraping. I am down to sanding it the best I can but what can I use to prep the area so I can paint? (There will probably be some glue left.) I will be using drywall compound to fix the tears and face removal of the drywall, but I am looking for suggestions on how to get the most glue off and also, knowing some will still be on the walls, how can I prep them for painting??

The products you are useing are the ones I would go with, but are you giving them enough time to work. You should let the removal product set at least 20 minutes and you should apply it at least twice which means you wait at least 40 minutes before you start doing anything to the wall. The best way to apply the remover is with a pump up garden sprayer and be sure to start at the bottom of the wall and go up. If you can not get all of the adhesive off this way then sanding is your last resort and if you can not get all of it off you will need to prime the walls with Bin primer from Zinsser and then you are ready to start repairing the walls.
If there is any other wallpaper in this house I would not remove it but just prime and paint over it as you have found out it really becomes a part of the wall when they were not properly prepared to start with.
Good luck.

I have waited. What is left on the walls is only wallpaper glue and in some spots very thick. I have sanded about a 1/3 of the area. Next I will go back over the area with warm water and TSP or DIF and then rinse again, prior to repairing the walls. Is the Zinnser brand the only thing you recommend? I bought KILZ Oil Based Primer to put over the prepped walls prior to painting.

I have found out that the BIN primer which is a white pigmented shellac ( there are other brands) holds back the staining from the adhesive left on the wall better than an oil based satin killer such as KILZ.

how can i get the glue off?

There have been some changes in things since this post started. I would use the DIF Gel remover to get off the glue that is still on the wall. Then you should prime with GARDZ from Zinnser which will hold back any remaining glue and it is water based, which means very little odor.

Hope this helps out.