I have a replacement EZL for my W140. It was used and I didn't know at first that I had to apply new thermal paste. My question is, do I have to remove ALL of the old paste from the old EZL and car body before putting on new and reinstalling the part on the car? I seen some thermal paste remover at radio shack, but wanted to be sure first before I spent the $ on it. I was wondering if I could scrape it off the best I could and re-apply.

Any info appreciated!